Pervin, William J. Foundations of general topology. [electronic resource] . — New York, : Academic Press, [1964]. — xi, 209 p. 24 cm. - Academic Press textbooks in mathematics. Bibliography: p. 197-200. ISBN: 0125509502 9780125509503 LCCN: 64017796 Nat. Bib. No.: GB64-13150 Subjects--Topical Terms: Topology.Topologie. LC Class. No.: QA611 / .P4 1964 Dewey Class. No.: 513.83