Ericson, P. G. P. (2012). «Evolution of terrestrial birds in three continents: biogeography and parallel radiations». Journal of Biogeography39 (5): 813–824. doi:10.1111/j.1365-2699.2011.02650.x.
Krishnan, A. (2023). Great Barbet (Psilopogon virens), version 2.0. In Birds of the World (N. D. Sly, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.grebar1.02