Babbie, Earl R. <br/><br/>
The basics of social research / 
Earl R. Babbie 
 - 7th ed. 
 - Boston, MA :  Cengage Learning,  [2017] 
 - xxvii, 530 p. :  col. ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781305503076 (pbk. : student ed.) 1305503074 (pbk.) 9781305677111 (loose-leaf ed.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research<br/>Social sciences--Methodology