Public Domain Tools (Steven Black)
For advanced tips and tricks, as well as pointers on little-known bugs and gotchas, you just
can't beat Hacker's Guide to Visual FoxPro 6.0. The book is an alphabetic reference, not a tutorial; it is quite handy for looking up the nuances of specific commands, functions, properties, and methods. Also provided with purchase is the entire book in Windows HTML Help format.
If you need an introduction to object-oriented programming but with a Visual FoxPro twist, check out Object Orientation in Visual FoxPro. It describes OOP concepts in plain English and with many diagrams and examples. It explains the terminology, concepts, and benefits of object technology as it relates to Visual FoxPro developers.