Johnson, David W.  1940 <br/><br/>
Circles of learning :  Cooperation in the classroom / 
David W. Johnson, Roger T. Johnson and Edythe Johnson Holubec. 
 - Edina, Minn. :  Interaction Book Co.,  1986. 
 - 124 p.  ill. ;  22 cm. 
<br/><br/> "Revised."  Rev. ed. of: Circles of learning / David W. Johnson ... [et al.]. 1984. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0939603012 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Group work in education<br/>Cooperative learning