J. Windsor Lewis, The official IPA vowel diagram, Journal of the International Phonetic Association, Vol. 6, No. 1 (June, 1976), pp. 29-31 ...

We learn about 6 vowel letters and the numerous sounds we make when using them. In English, we have 5 (well, sometimes 6) vowel letters, but way more vowel sounds. That’s where the IPA can help ...

The Sounds of English: Long Vowels - 5 Episode 5 / 13 Feb 2023 This is the fifth of five long vowel programmes in our series of videos that explore the sounds of English.