Well here are a few:
1) Understanding Exposure by Bryan Peterson
a very good book and often refrenced as a good place to start reading.
2) The Digital Photography book vols 1 and 2 by Scott Kelby
a pair of books that give simple info and tips on doing photography with a specific focus on digital. Note that the first book (not read the second, but its similar in theme) is not indepth and won't nessessarily explain all the details, but will give you good pointers to how to shoot - good place ot start
3) Langford's Basic Photography: The guide for serious photographers 8th edition
4) Langford's Advanced Photography 7th edition
Both of these are good books for people wishing to further their skills and understandings in photography