APA (7th ed.) Citation

Liu, C. L. (1968). Introduction to combinatorial mathematics. McGraw-Hill Book Co., Inc.

Chicago Style (17th ed.) Citation

Liu, C. L. Introduction to Combinatorial Mathematics. New York: McGraw-Hill Book Co., Inc, 1968.

MLA (9th ed.) Citation

Liu, C. L. Introduction to Combinatorial Mathematics. McGraw-Hill Book Co., Inc, 1968.