GOODCHILD, M. F. Citizens as sensors: web 2.0 and the volunteering of geographic information. GeoFocus. International Review of Geographical Information Science and Technology, [S. l.], n. 7, p. 8–10, 2007. Disponível em: https://www.geofocus.org/index.php/geofocus/article/view/107. Acesso em: 30 apr. 2025.