Qualitative Research Methods for the Social Sciences  / 
Bruce L. Berg. 
 - 3rd ed. 
 - Boston :  Allyn and Bacon,  1998. 
 - xiii,290 p,: 
<br/><br/><label>ISBN: </label>0205264751 
<br/><br/><label>LC Class. No.: </label>H61  / .B47 1998