Gay, L. R. <br/><br/>
Educational research :  compentencies for analysis and applications / 
L. R. Gay, Geoffrey E. Mills, Peter Airasian. 
 - 8th ed. 
 - Upper Saddle River, NJ :  Prentice Hall,  2006. 
 - xix, 614 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0131185349 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research.