Babbie, Earl. <br/><br/>
The Practice of social research / 
Earl Babbie. 
 - 4th ed. 
 - Belmont, California :  Wadsworth Publishing,  c1986. 
 - xxii, 577 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>053405658X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences Research. <br/>Social sciences Methodology. 
<br/><br/><label>LC Class. No.: </label>H62  / .B321986