J. Gualda-Barros, F. O. do Nascimento, and M. K. do Amaral, “A new species of Callicebus Thomas, 1903 (Primates, Pitheciidae) from the states of Mato Grosso and Pará, Brazil”, Pap. Avulsos Zool., vol. 52, no. 23, pp. 261–279, Jan. 2012, doi: 10.1590/S0031-10492012002300001.