Moyle, RG (2004). «Phylogenetics of barbets (Aves: Piciformes) based on nuclear and mitochondrial DNA sequence data». Molecular Phylogenetics and Evolution30 (1): 187-200. PMID15022769. doi:10.1016/S1055-7903(03)00179-9.
Moyle, RG (2004). «Phylogenetics of barbets (Aves: Piciformes) based on nuclear and mitochondrial DNA sequence data». Molecular Phylogenetics and Evolution30 (1): 187-200. PMID15022769. doi:10.1016/S1055-7903(03)00179-9.