SECHRIST, R. P.; GIBSON, A. Software Review. Cartographic Perspectives, [S. l.], n. 05, p. 17–20, 1990. DOI: 10.14714/CP05.1123. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp05-sechrist-gibson. Acesso em: 7 may. 2024.