Gaal , Steven A. <br/><br/>
Point Set Topology 
/by Steven A.  Gaal  
 - Mineola, New York  Dover Publications  2009 
 - 317p. 
<br/><br/><label>ISBN: </label>978-0-486-47222-5 
<br/><br/><label>Dewey Class. No.: </label>514  / GAA/P