Lehmann <br/><br/>
Educational research / 
by Lehmann  
 - New York :  Holt Rine hart,  1979. 
 - 433p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research
<br/><br/><label>Dewey Class. No.: </label>370.78  / LEH.E