GRAVES, G. R.; LANE, D. F.; O’NEILL, J. P.; VALQUI, T. A distinctive new subspecies of the Royal Sunangel (Aves: Trochiliformes; Heliangelus regalis) from the Cordillera Azul, northern Peru. Zootaxa, Auckland, New Zealand, v. 3002, n. 1, p. 52–58, 2011. DOI: 10.11646/zootaxa.3002.1.5. Disponível em: https://mapress.com/zt/article/view/zootaxa.3002.1.5. Acesso em: 13 apr. 2025.