Foundations of mixed methods research : integrating quantitative and qualitative approaches in the social and behavioral sciences /
Teddlie, Charles.
Foundations of mixed methods research : integrating quantitative and qualitative approaches in the social and behavioral sciences / Charles Teddlie, Abbas Tashakkori. - Los Angeles, [Calif.] ; London : SAGE, c2009. - viii, 386 p. : ill. ; 26 cm.