APA (7th ed.) Citation

Caldwell, I., & Thomason, D. (2004). The rule of four. Century.

Chicago Style (17th ed.) Citation

Caldwell, Ian, and Dustin Thomason. The Rule of Four. London: Century, 2004.

MLA (9th ed.) Citation

Caldwell, Ian, and Dustin Thomason. The Rule of Four. Century, 2004.