Gerring,John <br/><br/>
Case study research  : principles and practices  

 - Cambridge    Cambridge University Press  2007 
<br/><br/><label>ISBN: </label>978-0-521-67656-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research
<br/><br/><label>Dewey Class. No.: </label>001.432 GER