Mertens Donna M <br/><br/>
Research and evaluation in education and psychology : Integrating diversity with quantitative, qualitative and mixed methods 

 - 3 
 - Los Angeles, USA  Sage  2010 
 - xxiii,527p. 
<br/><br/><label>ISBN: </label>978-81-8387-282-9 
<br/><br/><label>Source: </label>Reference