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nih.gov
pubmed.ncbi.nlm.nih.gov
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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". Genetica. 135 (3): 299–304. doi:10.1007/s10709-008-9278-2. PMID18504528. S2CID22786201.
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Ridenhou, Larry. "NCA – Turkey Vulture". Snake River Birds of Prey National Conservation Area. Bureau of Land Management. Archived from the original on 2007-05-02. Retrieved 2006-12-17.
Paulik, Laurie (2007-08-06). "Vultures and Livestock". AgNIC Wildlife Damage Management Web. Archived from the original on 2007-08-08. Retrieved 2007-10-15.
Paulik, Laurie (2007-08-06). "Vultures". AgNIC Wildlife Damage Management Web. Archived from the original on 2007-08-04. Retrieved 2007-10-15.