วารสาร ป. ปก. Journal of Graduate School Sakon Nakhon Rajabhat University, Sakon Nakhon, Thailand, v. 10, n. 50, 2014. Disponível em: https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/26689. Acesso em: 20 sep. 2026.