Bales, Robert Freed,  1916-2004 <br/><br/>
Interaction process analysis :  method for the study of small goups / 
Robert F. Bales. 
 - Chicago, E.U.A. :  University of Chicago,  1950. 
 - 203 p. 
<br/><br/><label>ISBN: </label>0226036189 
<br/><br/><label>Encabezamiento--Tema: </label><br/>Interacción social