Chaffanjon;Jean. "Carte Croquis du Cours de L'Orénoque de Bolivar au Rio Meta." Map. In Revealing the 'Lost World': The American Geographical Society and the Mapping of Roraima during the 1930s;by Alastair Pearson and Michael Heffernan;188. Vol. 14. Journal of Latin American Geography;2015. Accessed March 4;2023. https://www.jstor.org/stable/43964634?seq=19.

Chaffanjon;Jean. "Carte Croquis du Cours de L'Orénoque de Bolivar au Rio Meta." Map. In Revealing the 'Lost World': The American Geographical Society and the Mapping of Roraima during the 1930s;by Alastair Pearson and Michael Heffernan;188. Vol. 14. Journal of Latin American Geography;2015. Accessed March 4;2023. https://www.jstor.org/stable/43964634?seq=19.