Johnson, David W & Johnson, Roger T <br/><br/>
Learning together and alone  Cooperative, competitive, and individualistic learning 

 - 2nd ed 
 - Prentice hall inc, New Jersey  1987 
 - xiv,193p 
<br/><br/><label>ISBN: </label>0-13-527871-6 
<br/><br/><label>Dewey Class. No.: </label>371.102 Joh/Joh