R. Johnson, Burke. <br/><br/>
Educational research :  quantitative, qualitative, and mixed approaches / 
R. Burke Johnson, Larry Christensen. 
 - 7th ed. 
 - Thousand  Oaks, Calif. :  Sage,  2020. 
 - xxxi,  672 p. :  ill. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9781544337838 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research.<br/>Science--Experiments--Methodology<br/>Experimental design