Doing some research for a nonfiction book I want to write, I stumbled across this book on Amazon.com. The book is by Janetta Rebold Benton. More information on her can be found here. She is a Fullbright Scholar and art historian.
The book that caught my interest is Holy Terrors: Gargoyles in Medieval Buildings. Below is the description from Amazon. Seems like a must read to me for any gargoyle lover.