Cita APA (7th ed.)

Allenby, R. B. J. T., & Slomson, A. B. (2011). How to count: An introduction to combinatorics (2nd ed.). CRC Press.

Cita Chicago (17th ed.)

Allenby, R. B. J. T., i A. B. Slomson. How to Count: An Introduction to Combinatorics. 2nd ed. Boca Raton, Fla: CRC Press, 2011.

Cita MLA (9th ed.)

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