AikiBib is a listing of English-language books on Aikido, related martial arts, weapons, and self defense maintained on the Aikido Shobukan Dojo website.
Compiled and edited by Chas Poor and Dan Wendling, this excellent resource lists more than 2000 items. A search on self defense in content brought up more than 200 listings. Not every book is valuable, but many provide useful information.
Books are valuable resources, but remember: You can't learn to fight from a book. Use these books as an introduction, not as a substitute for training.