"A Field Guide to Genetic Programming" (https://www.amazon.com/Field-Guide-Genetic-Programming/dp/14...) is one of the better books I've read on the matter (but I've yet to read anything by Koza). W. Langdon's webpage (http://www0.cs.ucl.ac.uk/staff/W.Langdon/) has a lot of great information.

Koza's text is good, but, depending on the student, may be a little deep to start with. I's suggest A Field Guide To Genetic Programming [1] as a better start for most programmers, and then follow up with Koza's books.

[1] http://www.amazon.com/Field-Guide-Genetic-Programming/dp/140...