Cita APA (7a ed.)

Riordan, J. (1958). An introduction to combinatorial analysis. John Wiley & Sons.

Cita Chicago Style (17a ed.)

Riordan, John. An Introduction to Combinatorial Analysis. New York [etc.]: John Wiley & Sons, 1958.

Cita MLA (9a ed.)

Riordan, John. An Introduction to Combinatorial Analysis. John Wiley & Sons, 1958.