Langenheim, J. H. «Preliminary Notes on Plant Fossils from Late Paleozoic and Early Mesozoic Rocks in the Cordillera Oriental of Colombia». Boletín de Geología, no. 3 (abril 8, 1959): 51–53. Accedido mayo 18, 2024. https://revistas.uis.edu.co/index.php/revistaboletindegeologia/article/view/4003.