BETTERLY, Jack. William J. Duiker and Jackson J. Spielvogel, World History. World History Connected, [S. l.], v. 3, n. 1, 2005. DOI: 10.13021/whc.v3i1.5137. Disponível em: https://journals.gmu.edu/whc/article/view/5137. Acesso em: 9 sep. 2025.