Yutakom, N., Thipkong, S., Rungsayatorn, S., Pongsophon, P., Lertamornpong, C., Jeerapattanatorn, P. and Setthakasivit, N. 2016. Professional development program to enhance pre-service teacher’s pedagogical content knowledge. Kasetsart Journal of Social Sciences. 37, 3 (Dec. 2016), 306–318.