Prum, R.O. (1988). "Phylogenetic interrelationships of the barbets (Aves: Capitonidae) and toucans (Aves: Ramphastidae) based on morphology with comparisons to DNA-DNA hybridization". Zoological Journal of the Linnean Society. 92 (4): 313–343. doi:10.1111/j.1096-3642.1988.tb01728.x. hdl:2027.42/73985.
Moyle, R.G. (2004). "Phylogenetics of barbets (Aves: Piciformes) based on nuclear and mitochondrial DNA sequence data". Molecular Phylogenetics and Evolution. 30 (1): 187–200. doi:10.1016/S1055-7903(03)00179-9. PMID15022769.
Buckio, B. (2020). Prong-billed Barbet (Semnornis frantzii), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.prbbar1.01 retrieved December 15, 2022
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Prum, R.O. (1988). "Phylogenetic interrelationships of the barbets (Aves: Capitonidae) and toucans (Aves: Ramphastidae) based on morphology with comparisons to DNA-DNA hybridization". Zoological Journal of the Linnean Society. 92 (4): 313–343. doi:10.1111/j.1096-3642.1988.tb01728.x. hdl:2027.42/73985.
Moyle, R.G. (2004). "Phylogenetics of barbets (Aves: Piciformes) based on nuclear and mitochondrial DNA sequence data". Molecular Phylogenetics and Evolution. 30 (1): 187–200. doi:10.1016/S1055-7903(03)00179-9. PMID15022769.