Patton, Michael Quinn. <br/><br/>
Qualitative research and evaluation methods / 
Michael Quinn Patton. 
 - 3rd ed. 
 - New York :  Sage Publications, Inc,  2001. 
 - xxiv, 598p ;  25 cm. 
<br/><br/> Rev. ed. of: Qualitative evaluation and research methods. 2nd. ed. 1990. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0761919716 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Methodology.<br/>Evaluation research (Social action programs)