Biggs, N. L. (1985). Discrete mathematics. Clarendon; Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Biggs, Norman L. Discrete Mathematics. Oxford ; New Delhi: Clarendon; Oxford University Press, 1985.
Lua MLA (8ú heag.)Biggs, Norman L. Discrete Mathematics. Clarendon; Oxford University Press, 1985.
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