Focus on Psychology:  A Guide to Mastering PETER GRAY'S PSYCHOLOGY. 
Trahan,Mary. 
 - 4th ed. 
 - New York:  Worth Publishers.  2002. 
 - xv,299 p:  ill;  27 cm 
<br/><br/><label>ISBN: </label>0716751631 
<br/><br/><label>LC Class. No.: </label>BF 121  / .T72 2002