1. Absy ML. 1979. A palynological study of Holocene sediments in the Amazon basin [PhD thesis]. University of Amsterdam.
2. Mise en évidence de quatre phases d‘ouverture de la forêt dense dans le sud-est de l‘Amazonie au cours des 60.000 dernières années. Première comparaison avec d‘autres regions tropicales;Absy ML;Comptes Rendues Académie des Sciences, Paris. 312 Serie,1991
3. Knowledge of Colombian biodiversity: published and indexed;Arbeláez-Cortés E.;Biodiversity and Conservation,2013
4. Bertsch K. 1942. Lehrbuch der Pollenanalyse. Stuittgart: Verlag Ferdinand Enke.
5. Bonifacino JM, Robinson H, Funk VA, Lack HW, Wagenitz G, Feuillet C, Hind DJN. 2009. A history of research in Compositae: early beginnings to the Reading Meeting (1975). In: Funk VA, Susanna A, Stuessy TF, Bayer RJ, editors. Systematics, evolution, and biogeography of Compositae. Washington (DC): International Association for Plant Taxonomy, Institute of Botany, University of Vienna and Smithonian National Museum of Natural History; p. 3–38.