Gualda-Barros, Juliana, et al. “A New Species of Callicebus Thomas, 1903 (Primates, Pitheciidae) from the States of Mato Grosso and Pará, Brazil”. Papéis Avulsos De Zoologia, vol. 52, no. 23, Jan. 2012, pp. 261-79, https://doi.org/10.1590/S0031-10492012002300001.