It is just for introduction purposes, but I want to have access to the best resource available right now. New books, specially. I wait for your advices. Thank you in advance!!!
I would suggest one of the following:
Creswell & Plano-Clark’s ‘Designing & Conudcting Mixed Methods Research’; Teddlie & Tashakkori’s ‘Foundations of Mixed Methods Research’, or; Bergman’s ‘Advances in Mixed Methods Research’.
Good luck.