PETERSON, M. Choropleth Google Maps. Cartographic Perspectives, [S. l.], n. 60, p. 80–83, 2008. DOI: 10.14714/CP60.237. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp60-peterson. Acesso em: 26 apr. 2024.