เอกพันธ์ ว. หน้าปก. Journal of Graduate School Sakon Nakhon Rajabhat University, Sakon Nakhon, Thailand, v. 16, n. 73, 2019. Disponível em: https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/198962. Acesso em: 10 oct. 2026.