I have a special fondness for difference equations since they are so much like differential equations but discrete. For some reason they seemed closer to the simple arithmetic one learns in high school but with the complexity that differential equations have. A classic in the field, I believe this book is a very good place to begin the study of difference equations. I would recommend it to anyone interested in learning more about difference equations.
Download LaTeXed Problems.As always, I would be interested in hearing back if any errors are found to exist.