CHU, G. H. The Animated Atlas of Air Traffic over North America. Cartographic Perspectives, [S. l.], n. 59, p. 41–42, 2008. DOI: 10.14714/CP59.247. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp59-chu. Acesso em: 20 jul. 2024.