APA

Liu C. L., . (1968). Introduction to combinatorial mathematics. New York: McGraw-Hill.

Chicago

Liu C L, . 1968. Introduction to combinatorial mathematics. New York: McGraw-Hill.

Harvard

Liu C. L., . (1968). Introduction to combinatorial mathematics. New York: McGraw-Hill.

MLA

Liu C L, . Introduction to combinatorial mathematics. New York: McGraw-Hill. 1968.