1. Paleogene non-marine Gualanday Group, Neiva Basin, Colombia, and regional development of the Colombian Andes;Anderson;Bulletin of the Geological Society of America,1972
2. The geology of the Neiva Sub-Basin, Upper Magdalena Basin, southern portion;Beltrán,1979
3. Mountain flank thrusting in Rocky Mountain foreland, Wyoming and Colorado;Berg;Bulletin of the American Association of Petroleum Geologists,1962
4. Thrust systems;Boyer;Bulletin of the American Association of Petroleum Geologists,1982
5. Geologic history of Colombia;Bürgl;Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales,1961