Creswell, John W. <br/><br/>
Research design :  qualitative, quantitative, and mixed methods approaches / 
John W. Creswell. 
 - 3. ed. 
 - Thousand Oaks, Calif. :  Sage Publications,  2009. 
 - xxix, 260 s. ;  26 cm. 
<br/><br/><label>ISBN: </label>141296556X (cloth) 9781412965569 (cloth) 1412965578 (pbk.) 9781412965576 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research--Methodology.<br/>Social sciences--Statistical methods.
<br/><br/><label>LC Class. No.: </label>H62  / C923 2009