Christensen, Larry B. <br/><br/>
Experimental methodology / 
Larry B. Christensen 
 - 2nd. ed. 
 - Boston :  Allyn and Bacon,  1980 
 - 420 p. :  ill. ;  24 cm. 
<br/><br/>p. 385-408 
<br/><br/><label>ISBN: </label>0205069606 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Psychology, Experimental<br/>Psychology--Experiments<br/>Experimental design