MARGRAF, Josef; MILAN, Paciencia P. Changing the traditional land use system of the world renowned Ifugao rice terraces. Annals of Tropical Research, [S. l.], v. 16, n. 3, p. 40–45, 1994. Disponível em: https://atr.vsu.edu.ph/article/view/589. Acesso em: 14 may. 2025.