Mlíkovský, J. 2015. The type specimens, type localities and nomenclature of Sarcoramphus vultures (Aves: Cathartidae), with a note on their speciation. Zootaxa. 3918, 4 (Feb. 2015), 579–586. DOI:https://doi.org/10.11646/zootaxa.3918.4.7.