Baum, John D. Elements of point set topology. - Englewood Cliffs, N.J.: Prentice-Hall, [c1964]. - x, 150 p.: diagrs.; 24 cm. Bibliography: p. 145-146. LCCN: 64013253 //r84 Nat. Bib. No.: GB64-12287 Subjects--Topical Terms: Topology. Dewey Class. No.: 514.322 / B347e