นิจจันทร์พันธ์ศรี เ.; คำพุฒ ป. Digital Dutch Cone Test. Frontiers in Engineering Innovation Research, [S. l.], v. 5, p. 51–54, 2005. Disponível em: https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242326. Acesso em: 16 sep. 2026.