The Hacker's Guide to Visual FoxPro 3.0 was one of the most highly regarded references works for Visual FoxPro. Written by Tamar Granor and Ted Roche, it was the manual that Microsoft should have shipped, but didn't.
It was re-written at great length for VFP 6, and released by Hentzenwerke Publishing. A smaller update was released for VFP 7, but disappointing sales stopped the series there.