APA (7th ed.) Citation

Birch, D., & Grebu, D. (1993). The king's chessboard. Penguin Books.

Chicago Style (17th ed.) Citation

Birch, David, and Devis Grebu. The King's Chessboard. New York: Penguin Books, 1993.

MLA (9th ed.) Citation

Birch, David, and Devis Grebu. The King's Chessboard. Penguin Books, 1993.

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