Babbie, Earl R <br/><br/>
The basics of social research / 
Earl Babbie 
 - 6th ed. 
 - Belmont, Calif. :  Wadsworth,  c2014 
 - xxvii, 542 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781133594147 113359414X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research<br/>Social sciences--Methodology