Cita APA (7th ed.)

Rival, I. (1986). Combinatorics and ordered sets. American Mathematical Society.

Cita Chicago (17th ed.)

Rival, Ivan. Combinatorics and Ordered Sets. Providence: American Mathematical Society, 1986.

Cita MLA (9th ed.)

Rival, Ivan. Combinatorics and Ordered Sets. American Mathematical Society, 1986.