KRYGIER, J. B. Geographic Information Systems: The Microcomputer And Modern Cartography. Cartographic Perspectives, [S. l.], n. 09, p. 24–26, 1991. DOI: 10.14714/CP09.1074. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp09-krygier. Acesso em: 6 may. 2024.