Rujukan Enggang_kelabu_Afrika

  1. ↑ BirdLife International (2016). "Lophoceros nasutus". Senarai Merah Spesies Terancam IUCN. 2016: e.T22682413A92944101. doi:10.2305/IUCN.UK.2016-3.RLTS.T22682413A92944101.en. Dicapai pada 12 November 2021.
  2. ↑ Joseph Michael Forshaw (1983). Kingfishers and Related Birds: Family Bucerotidae. 1–2. Lansdowne Editions. m/s. 77. ISBN 9780646221281.
  3. ↑ Brisson, Mathurin Jacques (1760). Ornithologie, ou, Méthode Contenant la Division des Oiseaux en Ordres, Sections, Genres, Especes & leurs Variétés (dalam bahasa French dan Latin). 4. Paris: Jean-Baptiste Bauche. m/s. 573–574, Plate 46 Fig 1.CS1 maint: unrecognized language (link)
  4. 1 2 Allen, J.A. (1910). "Collation of Brisson's genera of birds with those of Linnaeus". Bulletin of the American Museum of Natural History. 28: 317–335.
  5. ↑ Linnaeus, Carl (1766). Systema naturae : per regna tria natura, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis (dalam bahasa Latin). 1, Part 1 (ed. 12th). Holmiae (Stockholm): Laurentii Salvii. m/s. 154.
  6. ↑ Hemprich, Wilhelm; Ehrenberg, Christian Gottfried (1828). Symbolae physicae (dalam bahasa Latin). 1: Avium Part 1. Berolini [Berlin]: Ex Officina Academica. Pages are not numbered. Text and Note 8.
  7. 1 2 Gill, Frank; Donsker, David; Rasmussen, Pamela, penyunting (January 2022). "Mousebirds, Cuckoo Roller, trogons, hoopoes, hornbills". IOC World Bird List Version 12.1. International Ornithologists' Union. Dicapai pada 10 June 2022.
  8. ↑ Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. m/s. 230, 266. ISBN 978-1-4081-2501-4.
  9. ↑ Kemp, A.C. (2001). "African Grey Hornbill". Dalam del Hoyo, J.; Elliott, A.; Sargatal, J. (penyunting). Handbook of the Birds of the World. 6: Mousebirds to Hornbills. Barcelona, Spain: Lynx Edicions. m/s. 493. ISBN 978-84-87334-30-6. Unknown parameter |chapterurl= ignored (bantuan)

Rujukan

WikiPedia: Enggang_kelabu_Afrika http://www.boldsystems.org/index.php/TaxBrowser_Ta... https://books.google.com/books?id=SivTzPCzry0C https://digitallibrary.amnh.org/handle/2246/678 https://animaldiversity.org/accounts/Tockus_nasutu... https://archive.org/stream/Helm_Dictionary_of_Scie... https://archive.org/stream/Helm_Dictionary_of_Scie... https://archive.org/details/handbookofbirdso0006un... https://www.biodiversitylibrary.org/page/36195796 https://www.biodiversitylibrary.org/page/42946350 https://www.biodiversitylibrary.org/page/48510060