Like many scientists, I am addicted to learning as much information about my field as possible. That being said - does anyone have any books they consider to be a "must-have" for a professional involved in acoustic monitoring? 

I'll start by giving an example of one of mine. Although not a book about methods, one of my favorite textbooks regarding the subject is "Principles of Animal Communication" by Bradbury and Vehrencamp (http://www.sinauer.com/principles-of-animal-communication.html).