Dr. Linda Rammage, a speech-language pathologist, wrote a wonderful little book on vocal health called "Vocalizing with Ease." Here is a link to more information about the book, as well as some important “Do’s and Don’ts” for getting the most from your voice.
If you ever fear that you may have a vocal health issue in need of consultation, use this site as a reference.
http://pvcrp.com/about_pvcrp.php
