APA Edition Citation

Wallis, W. D., & George, J. C. (2011). Introduction to combinatorics.

Chicago Edition Citation

Wallis, W D., and J C. George. Introduction to Combinatorics. Chapman & Hall/CRC, London, 2011.

MLA Edition Citation

Wallis, W D., and J C. George. Introduction to Combinatorics. 2011.

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