Tham khảo Circus (chi chim)

  1. ↑ Oatley, Graeme; Simmons, Robert E.; Fuchs, Jérôme (2015). “A molecular phylogeny of the harriers (Circus, Accipitridae) indicate the role of long distance dispersal and migration in diversification”. Molecular Phylogenetics and Evolution 85: 150–60. PMID 25701771. doi:10.1016/j.ympev.2015.01.013. 
  2. ↑ Lacépède, Bernard Germain de (1799). “Tableau des sous-classes, divisions, sous-division, ordres et genres des oiseux”. Discours d'ouverture et de clôture du cours d'histoire naturelle (bằng tiếng Pháp). Paris: Plassan. tr. 4.  Page numbering starts at one for each of the three sections.
  3. ↑ Mayr, Ernst; Cottrell, G. William biên tập (1979). Check-list of Birds of the World. Volume 1 (ấn bản 2). Cambridge, Massachusetts: Museum of Comparative Zoology. tr. 316. 
  4. ↑ Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. tr. 109. ISBN 978-1-4081-2501-4.