A. Velasco Tirado, C. Pastor Martín, C. Sevilla Sánchez, C. I. Rodríguez Cano, J. Sánchez Fanjul, y J. Sánchez Fanjul, «Viewers of collaborative thematic cartography of the Spanish National Geographic Institute», MAPPING, vol. 27, n.º 192, pp. 30–36, ene. 2019.