Creswell, John W., <br/><br/>
Research design :  qualitative, quantitative, and mixed methods approaches / 
spine title :  Research design. 
John W. Creswell. 
 - Fourth Edition. 
 - xxix, 273 pages :  illustrations ;  26 cm. 
<br/><br/>Includes bibliographical references (p. 251-260) and indexes. 
<br/><br/>
<br/><br/><label>ISBN: </label>9781452226095 (cloth)  RM391.57 9781452226101 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research--Methodology.<br/>Social sciences--Statistical methods.