Petri, Herbert L. <br/><br/>
Motivation :  theory and research / 
Herbert L. Petri. 
 - 2nd ed. 
 - Belmont :  Wadsworth Publishing,  1986. 
 - xvi, 432 p. :  26 cm. 
<br/><br/><label>ISBN: </label>0534053823 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Motivation(Psychology).
<br/><br/><label>Dewey Class. No.: </label>153.8  / PEM 1986