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.

Winning Backgammon, by John Leet
Readers can learn the secrets of winning backgammon in this illustrated manual that explains the rules and mechanics of the game, including the often ignored use of the doubling cube, plus instruction in various strategies.