Theories of social work with groups / 
Robert W. Roberts and Helen Northen, editors. 
 - New York :  Columbia University Press,  1976. 
 - xviii, 401 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0231038852 
<br/><br/><label>LCCN: </label>76004967  
<br/><br/><label>LC Class. No.: </label>HV45 .R6  / .R6 
<br/><br/><label>Dewey Class. No.: </label>361.4