Eckhardt, Kenneth W. <br/><br/>
Social research methods :  Perspective, theory, and analysis / 
Eckhardt, K.W. and Erman, M.D. 
 - New York :  Random House,  1977. 
 - 410 p. 
<br/><br/><label>ISBN: </label>0-394-31256-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences