Baum, John D. <br/><br/>
Elements of point set topology. 

 - Englewood Cliffs, N.J.,  Prentice-Hall  [c1964] 
<br/><br/>Bibliography: p. 145-146. 
<br/><br/><label>LCCN: </label>64013253 //r84 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Topology.
<br/><br/><label>LC Class. No.: </label>QA611  / .B29 
<br/><br/><label>Dewey Class. No.: </label>513.83