Biggs, N. L. (2007). Discrete Mathematics (2nd.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Biggs, Norman L. Discrete Mathematics. 2nd. Oxford University Press, 2007.
Lua MLA (9ú heag.)Biggs, Norman L. Discrete Mathematics. 2nd. Oxford University Press, 2007.
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