Geerts, S.; Pauw, A. «Hyper-specialization for long-billed bird pollination in a guild of South African plants: the Malachite Sunbird pollination syndrome». South African Journal of Botany, 75, 4, 2009, pàg. 699–706. DOI: 10.1016/j.sajb.2009.08.001.
Prinzinger, R.; Schafer T.; Schuchmann K.L. «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 Biology, 17, 2, 3-1992, pàg. 71–79. DOI: 10.1016/0306-4565(92)90001-V.
Paton, D. C.; Collins, B. G. «Bills and tongues of nectar-feeding birds: A review of morphology, function and performance, with intercontinental comparisons». Australian Journal of Ecology, 14, 4, 1989, pàg. 473–506. DOI: 10.1111/j.1442-9993.1989.tb01457.x. ISSN: 1442-9993.
Bruneau, Anne «Evolution and homology of bird pollination syndromes in Erythrina (Leguminosae)». American Journal of Botany, 84, 1, 1997, pàg. 54–71. DOI: 10.2307/2445883. ISSN: 1537-2197. JSTOR: 2445883.
Siegfried, W. R.; Rebelo, A. G.; Prŷs-Jones, R. P.; Prys-Jones, R. P. «Stem Thickness of Erica Plants in Relation to Avian Pollination». Oikos, 45, 1, 1985, pàg. 153. DOI: 10.2307/3565234. JSTOR: 3565234.
Hargreaves, Anna L.; Johnson, Steven D.; Nol, Erica «Do floral syndromes predict specialization in plant pollination systems? An experimental test in an "ornithophilous" African Protea». Oecologia, 140, 2, 2004, pàg. 295–301. Bibcode: 2004Oecol.140..295H. DOI: 10.1007/s00442-004-1495-5. ISSN: 1432-1939. PMID: 15168105.
Ratsirarson, J «Pollination ecology of Aloe divaricata, Berger (Liliaceae): an endemic plant species of south-west Madagascar». South African Journal of Botany, 61, 5, 1995, pàg. 249–252. DOI: 10.1016/S0254-6299(15)30531-7.
Valente, Luis M.; Manning, John C.; Goldblatt, Peter; Vargas, Pablo «Did Pollination Shifts Drive Diversification in Southern African Gladiolus? Evaluating the Model of Pollinator-Driven Speciation.». The American Naturalist, 180, 1, 01-07-2012, pàg. 83–98. DOI: 10.1086/666003. ISSN: 0003-0147. PMID: 22673653.
Johnson Steven D. «The pollination niche and its role in the diversification and maintenance of the southern African flora». Philosophical Transactions of the Royal Society B: Biological Sciences, 365, 1539, 12-02-2010, pàg. 499–516. DOI: 10.1098/rstb.2009.0243. PMC: 2838267. PMID: 20047876.
Bruneau, Anne «Evolution and homology of bird pollination syndromes in Erythrina (Leguminosae)». American Journal of Botany, 84, 1, 1997, pàg. 54–71. DOI: 10.2307/2445883. ISSN: 1537-2197. JSTOR: 2445883.
Siegfried, W. R.; Rebelo, A. G.; Prŷs-Jones, R. P.; Prys-Jones, R. P. «Stem Thickness of Erica Plants in Relation to Avian Pollination». Oikos, 45, 1, 1985, pàg. 153. DOI: 10.2307/3565234. JSTOR: 3565234.
Valente, Luis M.; Manning, John C.; Goldblatt, Peter; Vargas, Pablo «Did Pollination Shifts Drive Diversification in Southern African Gladiolus? Evaluating the Model of Pollinator-Driven Speciation.». The American Naturalist, 180, 1, 01-07-2012, pàg. 83–98. DOI: 10.1086/666003. ISSN: 0003-0147. PMID: 22673653.
Johnson Steven D. «The pollination niche and its role in the diversification and maintenance of the southern African flora». Philosophical Transactions of the Royal Society B: Biological Sciences, 365, 1539, 12-02-2010, pàg. 499–516. DOI: 10.1098/rstb.2009.0243. PMC: 2838267. PMID: 20047876.
Paton, D. C.; Collins, B. G. «Bills and tongues of nectar-feeding birds: A review of morphology, function and performance, with intercontinental comparisons». Australian Journal of Ecology, 14, 4, 1989, pàg. 473–506. DOI: 10.1111/j.1442-9993.1989.tb01457.x. ISSN: 1442-9993.
Bruneau, Anne «Evolution and homology of bird pollination syndromes in Erythrina (Leguminosae)». American Journal of Botany, 84, 1, 1997, pàg. 54–71. DOI: 10.2307/2445883. ISSN: 1537-2197. JSTOR: 2445883.
Valente, Luis M.; Manning, John C.; Goldblatt, Peter; Vargas, Pablo «Did Pollination Shifts Drive Diversification in Southern African Gladiolus? Evaluating the Model of Pollinator-Driven Speciation.». The American Naturalist, 180, 1, 01-07-2012, pàg. 83–98. DOI: 10.1086/666003. ISSN: 0003-0147. PMID: 22673653.