Langer, Susanne K., <br/><br/>
An Introduction To Symbolic Logic 
Suanne K. Langer 
 - 3rd ed. Rev 
 - New York :  Dover Publications, Inc.  c1967. 
 - 367 p.:  [149] 
<br/><br/><label>ISBN: </label>0486601641 
<br/><br/><label>Dewey Class. No.: </label>511.3  / LAN/AN