Cita APA

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

Citación estilo Chicago

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

Cita MLA

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