APA Citation

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

Chicago Style Citation

Wallis, W. D., and J. C. (John Clay) George. Introduction to Combinatorics. Second edition.

MLA Citation

Wallis, W. D., and J. C. (John Clay) George. Introduction to Combinatorics. Second edition.

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