Yin, Robert K. <br/><br/>
Case stury research :  design and methjods / 
Robert K. Yin. 
 - 4th  ed. 
 - London :  SAGE,  2009. 
 - xiv, 219  p. 
<br/><br/><label>ISBN: </label>1412960991 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CASE method.<br/>Social science--Research--Methodology.