TORGUSON, J. The AGI Source Book for Geographic Information Systems 1995. Cartographic Perspectives, [S. l.], n. 23, p. 26–28, 1996. DOI: 10.14714/CP23.771. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp23-torguson. Acesso em: 4 may. 2026.