Bowie, R.C.K.; Fjeldså, J.; Hackett, S.J.; Crowe, T.M. (2004). Molecular evolution in space and through time: mtDNA phylogeography of the Olive Sunbird (Nectarinia olivacea/obscura) throughout continental Africa. Molecular Phylogenetics and Evolution. 33 (1): 56—74. doi:10.1016/j.ympev.2004.04.013. PMID15324839.
Bowie, R.C.K.; Fjeldså, J.; Hackett, S.J.; Crowe, T.M. (2004). Molecular evolution in space and through time: mtDNA phylogeography of the Olive Sunbird (Nectarinia olivacea/obscura) throughout continental Africa. Molecular Phylogenetics and Evolution. 33 (1): 56—74. doi:10.1016/j.ympev.2004.04.013. PMID15324839.