Langer, Jonas <br/><br/>
Theories of Development 
/ by Jonas Langer 
 - New York:  Holt, Rinehart and Winston, INC,   1969. 
 - xi, 191p.; 
<br/><br/><label>ISBN: </label>000 
<br/><br/><label>Dewey Class. No.: </label>591.3  / LAN/T