Geerts, S.; Pauw, A. (2009). "Hyper-specialization for long-billed bird pollination in a guild of South African plants: the Malachite Sunbird pollination syndrome". South African Journal of Botany75 (4): 699–706. doi:10.1016/j.sajb.2009.08.001.
Prinzinger, R.; Schafer T.; Schuchmann K.L. (March 1992). "Energy metabolism, respiratory quotient and breathing parameters in two convergent small bird species : the fork-tailed sunbird Aethopyga christinae (Nectariniidae) and the Chilean Hummingbird Sephanoides sephanoides (Trochilidae)". Journal of Thermal Biology17 (2): 71–79. doi:10.1016/0306-4565(92)90001-V. Bibcode: 1992JTBio..17...71P.
harvard.edu
adsabs.harvard.edu
Prinzinger, R.; Schafer T.; Schuchmann K.L. (March 1992). "Energy metabolism, respiratory quotient and breathing parameters in two convergent small bird species : the fork-tailed sunbird Aethopyga christinae (Nectariniidae) and the Chilean Hummingbird Sephanoides sephanoides (Trochilidae)". Journal of Thermal Biology17 (2): 71–79. doi:10.1016/0306-4565(92)90001-V. Bibcode: 1992JTBio..17...71P.
