Babbie, Earl R. <br/><br/>
The practice of social research / 
Earl Babbie. 
 - 11th ed. 
 - Belmont, CA :  Thomson Wadsworth,  c2007. 
 - xxiv, 511, [66] p. :  ill.  ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0495093254 9780495187387 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Methodology.<br/>Social sciences--Research.