ANGKASITH, P. Attitude of the Hilltribe Coffee Growers towards Coffee Growing and Extension in the Highlands. Kasetsart Journal of Social Sciences, [S. l.], v. 12, n. 1, p. 68–75, 1991. Disponível em: https://so04.tci-thaijo.org/index.php/kjss/article/view/243997. Acesso em: 17 sep. 2026.