1. Al-Raqqad, H. K., Al-Bourini, E. S., Al Talahin, F. M., & Aranki, R. M. E. (2017). The impact of school bullying on students’ academic achievement from teachers point of view. International Education Studies, 10(6), 44. doi:10.5539/ies.v10n6p44
2. Andri Priyatna. (2010). Lets End Bullying (Understanding, Preventing and Addressing Bullying). Jakarta : PT Elex Media Komputindo.
3. Astuti S. Endang & Resmininingsih. (2010). Bahan Dasar untuk Pelayanan
4. Konseling pada Satuan Pendidikan Menengah Jilid 1. [Basiq Competence for counselling Services]. Jakarta. Grasindo.
5. Baron, A. Robert & Byrne, Donn (2005). Social Psychology. X Edition. Translated by Ratna Djuwita. Published by Erlangga.
6. Barriball, K. L., & While, A. (1994). Collecting data using a semi-structured interview: A discussion paper. Journal of Advanced Nursing, 19(2), 328-335. doi:10.1111/j.1365-2648.1994.tb01088.x
7. Battistich, V. (2005). Character education, prevention, and positive youth development. International Journal of Behavioral Development, 42(2), 267-277. doi:10.1177/0165025417711057
8. Bennett, C. (2009). Literature review of bullying at schools. Retrieved from http://umanitoba.ca/faculties/education/media/Bennett-09.pdf
9. Berg, B.L. (2004) Methods for the social sciences. 5th edn. United States of America: Pearson
10. Bogdan, R. C. & Biklen, S. K. (2003). Qualitative research for education: An introduction to theories and methods (4th ed.). New York: Pearson Education.
11. Bowser, J., Larson, J. D., Bellmore, A., Olson, C., & Resnik, F. (2018). Bullying victimization type and feeling unsafe in middle school. The Journal of School Nursing, 34(4), 256-262. doi:10.1177/1059840518760983
12. British Educational Research Association [BERA]. (2018). Ethical Guidelines for Educational Research, fourth edition, London. Retrieved from https://www.bera.ac.uk/researchers-resources/publications/ethical-guidelines-for-educational-research-2018
13. Büyüköztürk, Ş., Kılıç Çakmak, E., Akgün, Ö. E., Karadeniz, Ş. & Demirel, F. (2008). Bilimsel araştırma yöntemleri. Ankara: Pegem Yayınları.
14. Campbell, Marilyn A (2005) Cyber bullying: An old problem in a new guise?. Australian Journal of Guidance, & Counselling, 1. (2005). This is the author's version of a paper that was later published as:
15. Cowie, Helen and Jennifer. Dawn (2009). Penanganan Kekerasan di Sekolah: Pendekatan Lingkup Sekolah untuk Mencapai Praktik Terbaik [Handling Violence in Schools: Whole-School Approach to Achieve Best Practices]. Jakarta, Indonesia: Indeks
16. Crick, N. R., & Dodge, K. A. (1999). ‘Superiority’ is in the eye of the beholder: A comment on sutton, smith, and swettenham. Social Development, 8(1), 128-131. doi:10.1111/1467-9507.00084
17. Denzin, N. K. & Lincoln, Y. S. (2005). The sage handbook of qualitative research. 3rd Edition, Sage, Thousand Oak.
18. Ditch the Label. (2018). The annual bullying survey 2018. Retrieved from https://www.ditchthelabel.org/wp-content/uploads/2018/06/The-Annual-Bullying-Survey-2018-2.pdf
19. Dörnyei, Z. (1994) ‘Motivation and motivating in the foreign language classroom’, Modern Language Journal, 78, pp. 273-284.
20. Ekosiswoyo, Rasdi. (2016) Kepemimpinan Kepala Sekolah Yang Efektif Kunci Pencapaian Kualitas Pendidikan [Effective Principal Leadership Keys of Achieving Education Quality]. Retrieved from https://media.neliti.com/media/publications/113918-ID-kepemimpinan-kepala-sekolah-yang-efektif.pd
21. Frey, K.S., Hirschstein, M.K., Snell, J.L., Edstrom, L.V.S., MacKenzie, E.P., & Broderick, C.J. (2005). Reducing playground bullying and supporting beliefs: An experimental trial of the steps to respect program. Developmental Psychology, 41, 479-491
22. Glaser, B. G. (1992) Theoretical sensitivity: advances in the methodology of grounded theory. Mill Valley, Ca: Sociology Press.
23. Glew, G. M., Fan, M., Katon, W., Rivara, F. P., & Kernic, M. A. (2005). Bullying, psychosocial adjustment, and academic performance in elementary school. Archives of Pediatrics & Adolescent Medicine, 159(11), 1026-1031. doi:10.1001/archpedi.159.11.1026
24. Glewwe, P., & Kremer, M. (2006). Chapter 16 schools, teachers, and education outcomes in developing countries. Handbook of the economics of education (pp. 945-1017) Elsevier B.V. doi:10.1016/S1574-0692(06)02016-2 Retrieved from https://www.sciencedirect.com/science/article/pii/S1574069206020162
25. Gov.uk. (2019a) Bullying at School. Retrieved from https://www.gov.uk/bullying-at-school
26. Guillemin, M. and Gillam, L. (2004) ‘Ethics, reflexivity, and “ethically important moments” in research’, Qualitative Inquiry, 10(2), pp. 261-280.
27. Haeseler, L. A. (2010). Stopping child bullying: Educators' diverse approaches for school improvement. Journal of Human Behavior in the Social Environment, 20(7), 952-962. doi:10.1080/10911359.2010.500923
28. Hazler, R. J., Hoover, J. H., & Oliver, R. (301). What do kids say about bullying? The Education Digest, 58(7), 16.
29. Hertinjung, S. Wisnu. (2013) Bentuk-Bentuk Perilaku Bullying Di Sekolah Dasar [Types of Bullying in Elementary School]. Retrieved from https://publikasiilmiah.ums.ac.id/bitstream/handle/11617/3952/D7.pdf;sequence=1
30. Hinduja, Sameer, & Patchin, W. Justin. (2010) Bullying, Cyberbullying, and Suicide, Archives of Suicide Research, 14:3, 206-221, DOI:0.1080/13811118.2010.4941
31. Ismiatun, Rohmah. (2014) Bullying di SD Negeri Gondolayu Kota Yogyakarta [Bullying at Gondolayu State Elementary School, Jakarta]. Retrieved from https://core.ac.uk/download/pdf/33517309.pdf
32. Juvonen, J., Yueyan Wang, & Espinoza, G. (2011). Bullying experiences and compromised academic performance across middle school grades. The Journal of Early Adolescence, 31(1), 152-173. doi:10.1177/0272431610379415
33. Kawabata, Naoto (2001). Adolescent Trauma in Japanese Schools: Two Case Studies of Ijime (Bullying) and School Refusal. Journal of the American Academy of Psychoanalysis: Vol. 29, No. 1, pp. 85-103.
34. Keputusan Presiden [Presidential Decree] No. 36 (1990) Konvensi Tentang Hak-Hak Anak [Convention on the Right of the Child]. Retrieved from http://ditjenpp.kemenkumham.go.id/arsip/ln/1990/kp36-1990.pdf.
35. Kubanyiova, M. (2013) ‘Ethical debates in research on language and interaction’, The Encyclopedia of Applied Linguistics, Blackwell Publishing Ltd.
36. Kumar, R. (2011) Research Methodology: A step by Step Guide for Beginner Barriball, K. L., & While, A. (1994). Collecting data using a semi-structured interview: A discussion paper. Journal of Advanced Nursing, 19(2), 328-335. doi:10.1111/j.1365-2648.1994.tb01088.x
37. Leithwood, K., Harris, A., & Hopkins, D. (2008). Seven strong claims about successful school leadership. School Leadership & Management, 28(1), 27-42. doi:10.1080/13632430701800060
38. Levine, E., & Tamburrino, M. (2014). Bullying among young children: Strategies for prevention. Early Childhood Education Journal, 42(4), 271-278. doi:10.1007/s10643-013-0600-y
39. Mayring, P. (2000). Qualitative content analysis, forum: Online Journal Qualitative Social Research, 1(2), 1-10.
40. McCudden, L. (2001) Bullying - A Teenager’s Perspective. Clinical Child Psychology and Psychiatry, 6(4), 609-611.
41. Merriam, B. S. (2002). Introduction to qualitative research s. 3rd Ed. London: Sage. Retrieved from http://stu.westga.edu/~bthibau1/MEDT%208484-%20Baylen/introduction_to_qualitative_research/introduction_to_qualitative_research.pdf
42. Merriam, S. B. (2009). In Merriam S. B. (Ed.), Qualitative research : A guide to design and implementation / sharan B. merriam ([2nd ed., rev. and expanded]. ed.). San Francisco: San Francisco : Jossey-Bass.
43. Minister of National Education Regulation Number 6 (2018) Penugasan Guru Sebagai Kepala Sekolah. [Teacher’s Additional Duty as Head Teacher] Retrieved from http://lppks.kemdikbud.go.id/uploads/pengumuman/1526355089Permendikbud_Nomor6_Tahun2018.pdf
44. Minister of Education and Culture Regulation No. 20 (2016) Standar Kompetensi Lulusan. [Graduate Competency Standard]. Retrieved from https://bsnp-indonesia.org/wp-content/uploads/2009/04/Permendikbud_Tahun2016_Nomor020_Lampiran.pd
45. Minister of Education and Culture Regulation No. 21 (2016) Standar Isi [Content Standard]. Retrieved from http://bsnp-indonesia.org/wp-content/uploads/2009/06/Permendikbud_Tahun2016_Nomor021_Lampiran.pdf
46. Minister of Education and Culture Regulation No. 22 (2016) Standar Proses [Process Standard] https://bsnp-indonesia.org/wp-content/uploads/2009/06/Permendikbud_Tahun2016_Nomor022_Lampiran.pdf
47. Minister of Education and Culture Regulation No. 23 (2016) Standar Penilain [Educational Assessment Standard]. https://bsnp-indonesia.org/wp-content/uploads/2009/09/Permendikbud_Tahun2016_Nomor023.pdf
48. Nunn, P. K. (2010). Bullying. Retrieved from https://search.credoreference.com/content/entry/sageukec/annotation/0