Allenby, R. (2011). How to count: An introduction to combinatorics (2nd ed.). CRC.
शिकागो स्टाइल उद्धरणAllenby, R.B.J.T. How to Count: An Introduction to Combinatorics. 2nd ed. Boca ration: CRC, 2011.
एमएलए उद्धरणAllenby, R.B.J.T. How to Count: An Introduction to Combinatorics. 2nd ed. CRC, 2011.
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