Hedberg library has access to thousands of books (both electronic and print) covering a wide range of music topics. Below are some popular titles.
A Conductor's Guide to Selected Baroque Choral-Orchestral Works by 
Sane Singing by 
So You Want to Sing Sacred Music by 
So You Want to Sing Spirituals by 
Vocal Health and Pedagogy: Science, Assessment,and Treatment, Third Edition
The Voice Teacher's Cookbook by 
