Predefinição:Roosmalen et al 2002
van Roosmalen, M.G.M.; van Roosmalen, T.; Mittermeier, R. (2002). «A taxonomic review of the titi monkeys, genus Callicebus Thomas, 1903, with the description of two new species, Callicebus bernhardi and Callicebus stephennashi, from Brazilian Amazonia» (PDF). Neotropical Primates. 10 (Suppl.): 1-52