CRAMPTON, J. Basic Cartography for Students and Technicians, Vol I, 2nd ed. Cartographic Perspectives, [S. l.], n. 21, p. 43–44, 1995. DOI: 10.14714/CP21.880. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp21-crampton. Acesso em: 8 may. 2024.