Marczyk, Geoffrey <br/><br/>
Essentials of research Design and Methodology 

 - 1st 
 -  John Wiley and Sons,Inc.  2005 
<br/><br/><label>ISBN: </label>978-0-471-47053-3 
<br/><br/><label>Dewey Class. No.: </label>150.2  / 2