Babbie E. <br/><br/>
The Practice of Social Research 

 - 15 Ed. 
 - United State,  Cengage,  2021. 
 - xxix,575p,  ill;  25cm. 
<br/><br/><label>ISBN: </label>9 780357 360767 
<br/><br/><label>Dewey Class. No.: </label>300.7