Liu, C. L. (1985). Elements of discrete mathematics (2nd ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Liu, C. L. Elements of Discrete Mathematics. 2nd ed. New York: McGraw-Hill, 1985.
Lua MLA (8ú heag.)Liu, C. L. Elements of Discrete Mathematics. 2nd ed. McGraw-Hill, 1985.
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