Pontryagin, L. S. (1952). Foundations of combinatorial topology. Graylock Press.
芝加哥风格引文Pontryagin, L. S. Foundations of Combinatorial Topology. Rochester, N.Y: Graylock Press, 1952.
MLA引文Pontryagin, L. S. Foundations of Combinatorial Topology. Graylock Press, 1952.
警告：这些引文格式不一定是100％准确.