Oppenheimer, Marina, and Luís Fábio Silveira. “ A Taxonomic Review of the Dark-Winged Trumpeter Psophia Viridis (Aves: Gruiformes: Psophiidae) ”. Papéis Avulsos de Zoologia 49, no. 41 (January 1, 2009): 547-555. Accessed April 18, 2021. https://www.revistas.usp.br/paz/article/view/33783.