Liu, C. L. (1968). Introduction to combinatorial mathematics. McGraw-Hill Book Co., Inc.
芝加哥风格引文Liu, C. L. Introduction to Combinatorial Mathematics. New York: McGraw-Hill Book Co., Inc, 1968.
MLA引文Liu, C. L. Introduction to Combinatorial Mathematics. McGraw-Hill Book Co., Inc, 1968.
警告：这些引文格式不一定是100％准确.