I'd suggest getting several books from your library, hopefully you have a state wide, or county wide inter-library loan and can get almost any book.
Ask your librarian, then you don't have to pay for books that only tell parts of the story and/or have incomplete information.
There are so many different ways to keep chickens depending on an individuals situation, that one or two books will not cover it all.
I've found most books to be lacking, some more than others, that I only bought Damerows The Chicken Health Handbook.
Story's Guide to Raising Chickens is pretty good too.
Read here too, lots of ideas you won't find in any book, and learn to use the advanced search function here as it can save a lot of time.