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Remsen, J. V., Jr.; Cadena, C. D.; Jaramillo, A.; Nores, M.; Pacheco, J. F.; Robbins, M. B.; Schulenberg, T. S.; Stiles, F. G.; Stotz, D. F. and Zimmer, K. J. (2007). A classification of the bird species of South America.Archiválva2011. május 16-i dátummal a Wayback Machine-ben South American Classification Committee. Hozzáférés ideje: 2007-10-15
Tagliarini, Marcella Mergulhão; Pieczarka, Julio Cesar; Nagamachi, Cleusa Yoshiko; Rissino, Jorge; de Oliveira, Edivaldo Herculano C. (2009). „Chromosomal analysis in Cathartidae: distribution of heterochromatic blocks and rDNA, and phylogenetic considerations”. Genetica135 (3), 299–304. o. DOI:10.1007/s10709-008-9278-2. PMID18504528.
Remsen, J. V., Jr.; Cadena, C. D.; Jaramillo, A.; Nores, M.; Pacheco, J. F.; Robbins, M. B.; Schulenberg, T. S.; Stiles, F. G.; Stotz, D. F. and Zimmer, K. J. (2007). A classification of the bird species of South America.Archiválva2011. május 16-i dátummal a Wayback Machine-ben South American Classification Committee. Hozzáférés ideje: 2007-10-15