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.
Atenció: Aquestes cites poden no estar 100% correctes.