1. P. Aleksandrov, Combinatorial topology Vol. 1, Graylock Press, New York, 1956.
2. J. Dugundji, Topology, Allyn and Bacon, Boston, 1966.
3. S. Eilenberg and N. Steenrod, Foundations of algebraic topology, Princeton, N. J., 1952.
4. J. Hocking and G. Young, Topology, Addison-Wesley, Reading, Mass., 1961.
5. W. Hurewicz and H. Wallman, Dimension theory, Princeton, N. J., 1941.