Teddlie, Charles. <br/><br/>
Foundations of mixed methods research : integrating quantitative and qualitative approaches in the social and behavioral sciences / Charles Teddlie, Abbas Tashakkori. 

 -  Thousand Oaks : Sage Publications, c2009. 
 - viii, 386 p. : ill. ; 25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences --Research --Methodology.