Yin, Robert K. <br/><br/>
Case study research :  designs and methods / 
by Robert K Yin. 
 - Newbury park :  sage publications,  1989. 
 - 165p. 
<br/><br/> volume 5. 
<br/><br/><label>ISBN: </label>0803934718 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Methodology.
<br/><br/><label>Dewey Class. No.: </label>300.722  / YIN.C.5