Brisson, Mathurin Jacques (1760). Ornithologie, ou, Méthode Contenant la Division des Oiseaux en Ordres, Sections, Genres, Especes & leurs Variétés (in French and Latin). Paris: Jean-Baptiste Bauche. pp. 34 Vol. 1, 460, Vol. 2.
Mackay, B.; Lee, A.T.K.; Barnard, P.; Møller, A.P.; Brown, M. (2017). "Urbanization, climate and ecological stress indicators in an endemic nectarivore, the Cape Sugarbird". Journal of Ornithology. 158 (4): 1013–1024. doi:10.1007/s10336-017-1460-9.
Lee, A.T.K.; Barnard, P.; Hockey, P.A. (2015). "Population metrics for fynbos birds, South Africa: densities, and detection and capture rates from a Mediterranean-type ecosystem". Ostrich. 86 (1–2): 179–187. doi:10.2989/00306525.2015.1021287.