ศรีจินดารัตน์(Usa Srijindarat) อ. (2012). Foundations of Mixed Methods Research: Integrating Quantitative and Qualitative Approaches in the Social and Behavioral Sciences. The Periodical of Behavioral Science, 18(1). Retrieved from https://so06.tci-thaijo.org/index.php/BSRI/article/view/844