Cita APA (7th ed.)

Percus, J. K. (1971). Combinatorial methods. Springer-Verlag.

Cita Chicago (17th ed.)

Percus, J. K. Combinatorial Methods. Nueva York: Springer-Verlag, 1971.

Cita MLA (9th ed.)

Percus, J. K. Combinatorial Methods. Springer-Verlag, 1971.