Marshall, Catherine. <br/><br/>
Designing qualitative research / 
Catherine Marshall, Gretchen B. Rossman. 
 - 5th  ed. 
 - London :  Sage,  2011. 
 - xxii, 321  p. 
<br/><br/><label>ISBN: </label>1412970440 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research--Methodology.