Johnson, Burke <br/><br/>
Educational research :  quantitative, qualitative, and mixed approaches / 
Burke Johnson, Larry Christensen 
 - 4th ed. 
 - Thousand Oaks, CA :  SAGE,  2012 
 - xxvi, 621 p. :  ill. ;  27 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781412978286 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research