Appearing first in 1981, this dictionary remains the largest and most comprehensive book of sign language ever published. Now, completely revised and expanded, American Sign Language
I love this book. It was given to me by a friend when my daughter and I were interested in teaching her son sign language. It's very easy to look something up and learn it. Everything makes sense. Each sign has a rhyme and reason behind why it is the sign for the thing. (Probably makes more sense than words sometimes!)