Music Performance and Pedagogy: Voice: Diction

A Handbook of Diction for Singers: Italian, German, French by David Adams

Diction for Singers: a Concise Reference for English, Italian, Latin, German, French, and Spanish by Joan Wall; Robert Caldwell; Gavilanes; Allen

Diction: Italian, Latin, French, German; the sounds and 81 exercises for singing them by John Moriarty

A Singer's Manual of Spanish Lyric Diction by Nico Castel

Singing in Russian by Emily Olin

The Use of the International Phonetic Alphabet in the Choral Rehearsal by Duane Richard Karna (Editor)

International Phonetic Alphabet for Singers by Joan Wall

Singing Early Music: The Pronunciation of European Languages in the Late Middle Ages and Renaissance. by A. G. Rigg; Timothy J. McGee (Editor); David Klausner