1. Asuncion, Z.,& Querol, M. (2013).Lectal Classification and phonological features of Ifugao andIlocano speakers[UnpublishedMaster’sthesis].Saint Mary’s University, Bayombong, NuevaVizcaya.
2. Bautista, M.L. (2000).Defining Standard Philippine English: Its status and grammatical features.De La Salle University Press.Inc.
3. Berowa, A. M. C.,& Dita, S. N.(2021). Illustrating the suprasegmental features of PhilippineEnglish phonology: A mother-based approach.Asian ESP Journal 17(4.3),89–111.
4. Deterding, D. (1994). The intonation of Singapore English.Journal of the InternationalPhoneticAssociation, 24(2), 61–72.
5. Dita, S.N. & De Leon, K. D. (2017). The intelligibility of Philippine English to ESL speakers.Philippine ESL Journal, 19(2), 100–113.
6. Dita, S.N. & De Leon, K. D. (2022). Intelligibility. In A. M. Borlongan (Ed.),Philippine English:Development, structure, and sociology of English in the Philippines(pp. 221–230).Routledge.
7. Gonzalez, A. (1997).The history of English in the Philippines. In M.L.S. Bautista (Ed.),English is an Asian language: The Philippine context(pp. 25–40). The Macquarie Library.
8. Gonzalez, A., & Alberca, W. (1978).Philippine English of the mass media. Linguistic Society of the Philippines.
9. Ilocano. (2024). In Komisyon sa Wikang Filipino. https://kwfwikaatkultura.ph/ilokano/
10. Llamzon, T. A. (1969). Standard Filipino English. Ateneo University Press.
11. Llamzon, T. A. (1997). The phonology of Philippine English. In M. L. S. Bautista (Ed.), English is an Asian language: The Philippine context (pp. 41–48). Proceedings of the conference held in Manila on August 2–3, 1996. Macquarie Library.
12. Olaya, N. (1967). A phonological grammar of a dialect of Ilocano [Unpublisehd master’s thesis] University of British Columbia, Canada. Retrieved August 28, 2017, from https://open.library.ubc.ca/media/download/pdf/831/1.0104590/
13. Moorthy, S. M., & Deterding, D. (2000). Tree or three? Dental fricatives in the speech of educated Singaporeans. In A. Brown, D. Deterding & Low, E. L. (Eds.), The English language in Singapore: Research on pronunciation (pp. 76–83). Singapore Association for Applied Linguistics.
14. Phoon, H. S., Abdullah, A. C., & Maclagan, M. (2013). The consonant realizations of Malay-, Chinese-and Indian-influenced Malaysian English. Australian Journal of Linguistics, 33(1), 3– 30. https://doi.org/10.1080/07268602.2013.787902
15. Philippine Statistics Authority. Retrieved from https://psa.gov.ph/
16. Rubino, C. G. (2000). Ilocano dictionary and grammar. University of Hawaii Press.
17. Tayao, L. (2004). The evolving study of Philippine English phonology. World Englishes, 23(1), 77–90. https://doi.org/10.1111/j.1467-971X.2004.00336.x