Gómez-Posada, C.; Martínez, J.; Giraldo, P.; Kattan, G. H. Density, Habitat Use, and Ranging Patterns of Red Howler Monkeys in a Colombian Andean Forest. Neotrop. Primates 2007, 14 (1), 2-10. https://doi.org/10.1896/044.014.0102.