APA
Robertie B., . (2000). 501 Backgammon Problems. : Cardoza.
Chicago
Robertie Bill, . 2000. 501 Backgammon Problems. : Cardoza.
Harvard
Robertie B., . (2000). 501 Backgammon Problems. : Cardoza.
MLA
Robertie Bill, . 501 Backgammon Problems. : Cardoza. 2000.