This is a list of reference materials useful for the methods I teach
Books
John Moriarty's 'Diction'
https://archive.org/details/dictionitalianla00mori
Appelman's 'Science of Vocal Pedagogy'
https://publish.iupress.indiana.edu/projects/the-science-of-vocal-pedagogy
The Alexander Technique - A Step By Step Guide
https://archive.org/details/alexandertechniq0000mast
Nelson's Singing With Your Whole Self - Feldenkrais method
https://archive.org/details/singingwithyourw0000nels
Twenty Four Italian Songs and Arias
https://imslp.org/wiki/24_Italian_Songs_and_Arias_of_the_17th_and_18th_Centuries_(Various)
Videos
From "Diction"
Lesson1:
https://www.youtube.com/watch?v=sXCEp50t-LA
Lesson2:
https://www.youtube.com/watch?v=s-Mosn8wfME
Links
Interactive IPA chart: