Brisson, Mathurin Jacques (1760). Ornithologie, ou, Méthode Contenant la Division des Oiseaux en Ordres, Sections, Genres, Especes & leurs Variétés (in French and Latin). Vol. 1. Paris: Jean-Baptiste Bauche. pp. 450–452, plate 35.
Mikula, P.; Morelli, F.; Lučan, R. K.; Jones, D. N.; Tryjanowski, P. (2016). "Bats as prey of diurnal birds: a global perspective". Mammal Review. 46 (3): 160–174. Bibcode:2016MamRv..46..160M. doi:10.1111/mam.12060.
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Mikula, P.; Morelli, F.; Lučan, R. K.; Jones, D. N.; Tryjanowski, P. (2016). "Bats as prey of diurnal birds: a global perspective". Mammal Review. 46 (3): 160–174. Bibcode:2016MamRv..46..160M. doi:10.1111/mam.12060.
Wink M, Sauer-Gürth H (2000). "Advances in the molecular systematics of African Raptors". In Chancellor RD, Meyburg BU (eds.). Raptors at Risk(PDF). WWGBP/HancockHouse. pp. 135–147.