Duque, Néstor Roncancio, and Carolina Gómez-Posada. 2009. “Sympatric Alouatta Seniculus and Cebus Capucinus in an Andean Forest Fragment in Colombia: A Survey of Population Density”. Neotropical Primates 16 (2): 51-56. https://doi.org/10.1896/044.016.0201.