เอกพันธ์ ว. หน้าปก. Journal of Graduate School Sakon Nakhon Rajabhat University, Sakon Nakhon, Thailand, v. 15, n. 70, 2018. Disponível em: https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/148259. Acesso em: 3 sep. 2026.