Dyfyniad APA

Allenby, R. (2011). How to count: An introduction to combinatorics (2nd ed.). CRC.

Dyfyniad Arddull Chicago

Allenby, R.B.J.T. How to Count: An Introduction to Combinatorics. 2nd ed. Boca ration: CRC, 2011.

Dyfyniad MLA

Allenby, R.B.J.T. How to Count: An Introduction to Combinatorics. 2nd ed. CRC, 2011.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.