Marcella Mergulhão Tagliarini, Julio Cesar Pieczarka, Cleusa Yoshiko Nagamachi, Jorge Rissino e Edivaldo Herculano C. de Oliveira, Chromosomal analysis in Cathartidae: distribution of heterochromatic blocks and rDNA, and phylogenetic considerations, in Genetica, 135 (3), 2009, pp. 299–304, DOI:10.1007/s10709-008-9278-2, PMID18504528.
Harvey I. Fisher, The Pterylosis of the Andean Condor, in Condor, 44 (1), febbraio 1942, pp. 30–32, DOI:10.2307/1364195, JSTOR1364195.
Harvey I. Fisher, The Pterylosis of the Andean Condor, in Condor, 44 (1), febbraio 1942, pp. 30–32, DOI:10.2307/1364195, JSTOR1364195.
lsu.edu
museum.lsu.edu
Remsen, J. V., Jr.; C. D. Cadena; A. Jaramillo; M. Nores; J. F. Pacheco; M. B. Robbins; T. S. Schulenberg; F. G. Stiles; D. F. Stotz & K. J. Zimmer. 2007. A classification of the bird species of South America.Archiviato il 2 marzo 2009 in Internet Archive. South American Classification Committee. Retrieved on 2007-10-15
Marcella Mergulhão Tagliarini, Julio Cesar Pieczarka, Cleusa Yoshiko Nagamachi, Jorge Rissino e Edivaldo Herculano C. de Oliveira, Chromosomal analysis in Cathartidae: distribution of heterochromatic blocks and rDNA, and phylogenetic considerations, in Genetica, 135 (3), 2009, pp. 299–304, DOI:10.1007/s10709-008-9278-2, PMID18504528.
Remsen, J. V., Jr.; C. D. Cadena; A. Jaramillo; M. Nores; J. F. Pacheco; M. B. Robbins; T. S. Schulenberg; F. G. Stiles; D. F. Stotz & K. J. Zimmer. 2007. A classification of the bird species of South America.Archiviato il 2 marzo 2009 in Internet Archive. South American Classification Committee. Retrieved on 2007-10-15