Gay, L. R. <br/><br/>
Educational Research : competencies for analysis and application 

 - 4th Ed 
 - Merrill, New york  1992 
 - xxv, 645 
<br/><br/><label>ISBN: </label>0-02-340800-6 
<br/><br/><label>Dewey Class. No.: </label>370.78 Gay