^Suzanna Bet Hashim and Brown, Adam (2000) 'The [e] and [æ] vowels in Singapore English'. In Adam Brown, David Deterding and Low Ee Ling (eds.) The English Language in Singapore: Research on Pronunciation, Singapore: Singapore Association for Applied Linguistics ISBN 978-981-04-2598-2, pp. 84–92.
^ 40.040.1Deterding, David (2000) 'Measurements of the /eɪ/ and /oʊ/ vowels of young English speakers in Singapore'. In Adam Brown, David Deterding and Low Ee Ling (eds.), The English Language in Singapore: Research on Pronunciation, Singapore: Singapore Association for Applied Linguistics, pp. 93–99.
^Tay Wan, Joo; Mary. 'The phonology of educated Singapore English'. English World-Wide. 1982, 3 (2): 135–45. doi:10.1075/eww.3.2.02tay.
^Lee, Ee May and Lim, Lisa (2000) ' Diphthongs in Singaporean English: their realisations across different formality levels, and some attitudes of listeners towards them. In Adam Brown, David Deterding and Low Ee Ling (eds.), The English Language in Singapore: Research on Pronunciation, Singapore: Singapore Association for Applied Linguistics, pp. 100–111.
Harrington, J.; Cox, F.; Evans, Z. An acoustic phonetic study of broad, general, and cultivated Australian English vowels. Australian Journal of Linguistics. 1997, 17: 155–84. doi:10.1080/07268609708599550.
Kenyon, John S. American Pronunciation 10th. Ann Arbor: George Wahr. 1950.
Scobbie, James M.; Gordeeva, Olga B.; Matthews, Benjamin. Acquisition of Scottish English Phonology: an overview. Edinburgh: QMU Speech Science Research Centre Working Papers. 2006.