Heymann, Eckhard W., Filomeno Encarnación, and Pekka Soini. 2002. “On the Diagnostic Characters and Geographic Distribution of the ‘yellow-handed’ Titi Monkey, Callicebus Lucifer, in Peru”. Neotropical Primates 10 (3): 124-26. https://doi.org/10.62015/np.2002.v10.517.