APA (7th ed.) Citation

Robertie, B. (2004). 501 essential backgammon problems ([2nd ed.?].). Cardoza Publishing.

Chicago Style (17th ed.) Citation

Robertie, Bill. 501 Essential Backgammon Problems. [2nd ed.?]. New York: Cardoza Publishing, 2004.

MLA (9th ed.) Citation

Robertie, Bill. 501 Essential Backgammon Problems. [2nd ed.?]. Cardoza Publishing, 2004.

Warning: These citations may not always be 100% accurate.