CHRISMAN, N. John Sherman and the Origins of GIS. Cartographic Perspectives, [S. l.], n. 27, p. 8–13, 1997. DOI: 10.14714/CP27.710. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp27-chrisman. Acesso em: 28 mar. 2024.