Cita APA (7th ed.)

Pontryagin, L. S. (1952). Foundations of combinatorial topology. Graylock Press.

Cita Chicago (17th ed.)

Pontryagin, L. S. Foundations of Combinatorial Topology. Rochester, N.Y: Graylock Press, 1952.

Cita MLA (9th ed.)

Pontryagin, L. S. Foundations of Combinatorial Topology. Graylock Press, 1952.