Witmer, Helen Leland <br/><br/>
Social work :  an analysis of a social institution / 
by Helen Leland Witmer. 
 - New York :  Farrar & Rinehart,  1942. 
 - xv, 539 p. 
<br/><br/><label>Encabezamiento--Tema: </label><br/>Servicio social