↑Boev, Z. 2010. Gyps bochenskii sp. n. (Aves: Falconiformes) from the Late Pliocene of Varshets (NW Bulgaria). – Acta zoologica bulgarica, 62 (2): 211-242.
↑Marco, A.S. (2007). New occurrences of the extinct vulture Gyps melitensis (Falconiformes, Aves) and a reappraisal of the paleospecies Journal of Vertebrate Paleontology, 27(4), 1057-1061