Prossl, Klaus F., y Joachim R. Grosser. 1994. «Some New Palynomorphs from the Silurian of the Quetame Massif, Cordillera Oriental, Colombia, South America». Boletín Geológico 34 (2-3):28-38. https://doi.org/10.32685/0120-1425/bolgeol34.2-3.1994.357.