Excellence in Singing: Multilevel Learning and Multilevel Teaching by 
The Singing Teacher's Guide to Transgender Voices by 
Teaching Singing in the 21st Century by 
On the Art of Singing by 
Coffin's Sounds of Singing by 
The Complete Collaborator: The Pianist As Partner by 
A Spectrum of Voices: Prominent American Voice Teachers Discuss the Teaching of Singing by 