Ary, Donald <br/><br/>
Introduction to research in education / 
by D. Ary, L.C. Jacobs, A. Razavieh. 
 - 5th ed. 
 - Forth Worth :  Harcourt Brace College,  1996. 
 - XVIII, 590 p. :  fig. ;  24 cm. 
<br/><br/>Index pp. 577-590 
<br/><br/><label>ISBN: </label>0-15-500982-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education