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Vowel diagram - Wikipedia
PALS1004 Introduction to Speech Science - University College …
Vowels (Chapter 5) - Introducing Phonetic Science
How to use a vowel grid (in 8 minutes). - YouTube
Cardinal vowels - Wikipedia
Vowel - Wikipedia
What Is a Vowel Quadrilateral - Making English Fun
IPA Online - Vowels - Newcastle University
Vowel Theories - University of Southern California