CHAME, Marcia; OLMOS, Fábio. Two howler species in southern Piauí, Brazil?. Neotropical Primates, Arlington, VA, USA, v. 5, n. 3, p. 74–77, 1997. DOI: 10.62015/np.1997.v5.378. Disponível em: https://primate.socgen.ucla.edu/index.php/multivitaminic/article/view/378.. Acesso em: 6 feb. 2025.