Thirty One
Book describes a game called 31, similar to the regular Backgammon game.

Starting Out in Backgammon, by Paul Lamford
This book is a user-friendly introduction to the game, ex-British champion Paul Lamford provides newcomers to the game with a thorough grounding in the essentials of play.

How Good Are You at Backgammon, by Nicolaos S. Tzannes, Basil Tzannes
This book contains fifty challenging situations for you to rate your ability with the experts. Suggestions and rules of thumb for improving your strategies during the various stages of the game.