สุทธิมาร อ. ปก. Research and Development Journal Suan Sunandha Rajabhat University, Bangkok, Thailand, v. 7, n. 1, 2019. Disponível em: https://so05.tci-thaijo.org/index.php/irdssru/article/view/214497. Acesso em: 7 ต.ค. 2026.