Creswell, John W <br/><br/>
Research design     qualitative quantitative and mixed methods approaches/ 
John W Creswell 
 - 2a ed. 
 - USA    Sage Pub,   c2003 
 - 245p. 
<br/><br/> Incluye referencias bibliograficas 
<br/><br/><label>ISBN: </label>0761924418 
<br/><br/><label>LC Class. No.: </label>H62  / .C6963 2003