Hurley, Patrick J. <br/><br/>
A concise introduction to logic / 
Patrick J. Hurley. 
 - 6th Editon 
 - New York :  Wadsworth Publishing Company,  1997. 
 - xvi, 655 p. 
<br/><br/><label>ISBN: </label>053450535x 
<br/><br/><label>Dewey Class. No.: </label>160  / HUR