CHUNKAO, K.; UNGKULPAKDIKUL, S. Soil pH of Various Depths in Hill-Evergreen Forest at Doi Pui, Chiengmai. Agriculture and Natural Resources, Bangkok, Thailand, v. 8, n. 1, p. 40–43, 1974. Disponível em: https://li01.tci-thaijo.org/index.php/anres/article/view/240679. Acesso em: 18 sep. 2026.