Zehna, Peter W. <br/><br/>
Elements of set theory 
[by] Peter W. Zehna [and] Robert L. Johnson. 
 - 2d ed. 
 - Boston  Allyn and Bacon  [1972] 
 - ix, 197 p.  24 cm. 
<br/><br/>Bibliography: p. 179-180. 
<br/><br/><label>LCCN: </label>75162879 //r86 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Set theory.<br/>Logic, Symbolic and mathematical
<br/><br/><label>LC Class. No.: </label>QA248.3  / .Z45 1972 
<br/><br/><label>Dewey Class. No.: </label>511/.3