Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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