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  1. Vowel diagram - Wikipedia

  2. PALS1004 Introduction to Speech Science - University College …

  3. Vowels (Chapter 5) - Introducing Phonetic Science

  4. How to use a vowel grid (in 8 minutes). - YouTube

  5. Cardinal vowels - Wikipedia

  6. Vowel - Wikipedia

  7. What Is a Vowel Quadrilateral - Making English Fun

  8. IPA Online - Vowels - Newcastle University

  9. Vowel Theories - University of Southern California