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Boubli, J. P.; M. N. F. Da Silva; M. V. Amado; T. Hrbek; F. B. Pontual; I. P. Farias (2008). "A Taxonomic Reassessment of Cacajao melanocephalus Humboldt (1811), with the Description of Two New Species". International Journal of Primatology. 29 (3): 723–741. doi:10.1007/s10764-008-9248-7. S2CID26561719.