WIITALA, S. A. (1987). Discrete Mathematics A Unified Approach Stephen A. Wiitala. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)WIITALA, Stephen A. Discrete Mathematics A Unified Approach Stephen A. Wiitala. McGraw-Hill, 1987.
Lua MLA (8ú heag.)WIITALA, Stephen A. Discrete Mathematics A Unified Approach Stephen A. Wiitala. McGraw-Hill, 1987.
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