The Btrieve Complete book by Jim Kyle has become the defining text for Btrieve databases over the years.
While it only discusses Btrieve V5 and V6, this book remains at the top of the list for anyone supporting Btrieve databases for a living! This 500+ page book includes a 3.5" floppy diskette with source code of the included utilities.
Btrieve Complete, by Jim Kyle
Goldstar SKU: BtrieveComplete