Cohen, Louis  (1928-....) <br/><br/>
Research methods in education  [Texte imprimé] / 
Louis Cohen and Lawrence Manion 
 - 2nd ed. 
 - London:  Croom Helm,  1985 
<br/><br/>Bibliogr. p. 361-373 
<br/><br/><label>ISBN: </label>0-7099-3438-6 
<br/><br/><label>Dewey Class. No.: </label>370.72