Rujukan Kebundaran_vokal

  • Catford, J. C. (1982) Fundamental Problems in Phonetics. Bloomington: Indiana University Press.
  • Engstrand, O. (1999). Illustrations of the IPA: Swedish in IPA (1999).
  • IPA - The International Phonetic Association (1999). Handbook of the International Phonetic Association. Cambridge: Cambridge University Press.
  • Ladefoged, P. & Maddieson, I. (1996). The Sounds of the World's Languages. Oxford: Blackwell. ISBN 0-631-19814-8.
  • Okada, H. (1999). Illustrations of the IPA: Japanese in IPA (1999).
  • Trask, R. L. (1996). A dictionary of phonetics and phonology. Routledge: London & New York.