1. Lisker, L. & Abramson, A. 1964. A Cross-Language Study in Initial Stops: Acoustical Measurements. Words 20, 384-442.
2. Cho, T., & Ladefoged, P. (1999) Variations and universals in VOT: evidence from 18 languages. Journals of Phonetics, 27, 207-229.
3. David, B., & Macken, M.A. (1978). The acquisition of the voicing contrast in English: a study of voice onset time in word-initial stop consonants. J. Child Lang, 7, 41-74.
4. Davis, K. (1995) Phonetic and phonological contrasts in the acquisition of voicing: voice onset time production in Hindi and English. J. Child Lang. 22, 275-305.
5. Kenney, M.K., & Smith, B.L. (1999). A longitudinal study of the development of temporal properties of speech production: Data from 4 children. Phonetica, 56, 56-72.
6. Koenigsknecht, R.A., & Zlatin, M.A. (1976). Development of the voicing contrast: A comparison of voice onset time in stop perception and production. Journal of Speech and Hearing Research, 19, 78-92.
7. Kuijpers, C.T.L. (1993 b). Temporal aspects of the voiced – voiceless distinction in speech development of young Dutch children. Journals of Phonetics, 21, 313-327.
8. Marshall, J., & Whiteside, S.P. (2001). Phonetica, 58, 196-210.
9. Shahidi, A.H. 2006. Analisis akustik terhadap realisasi kontras penyuaraan bunyi plosif dalam bahasa Melayu: Satu penelitian awal dlm. Kemelayuan Indonesia dan Malaysia: Sejarah dan Sejarah Maritim, Sosial-Politik dan Ekonomi. Vol 1. Seminar bersama Universitas Hasanuddin dan Universitas Kebangsaan Malaysia. Jakarta: Departemen Kebudayaan dan Pariwisata K1.
10. Shahidi, A.H. 2010. An acoustic and perceptual analysis of the phonetic properties of Malay English in comparison to those of Malay. Tesis Dr. Fal, Speech and Language Sciences Section, University of Newcastle upon Tyne.
11. Shahidi, A.H, Rahim Aman & Zulkifley Hamid. (2012). Kajian akustik realisasi kontras penyuaraan bunyi plosif bahasa Melayu. GEMA Online, Journal of Language Studies. 12(2): 745-760.