CRAMPTON, J. Network Resources for Map People. Cartographic Perspectives, [S. l.], n. 09, p. 20–22, 1991. DOI: 10.14714/CP09.1072. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp09-crampton. Acesso em: 1 may. 2024.