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- the World. Helm Identification Guides. A&C Black. pp. 457–59. ISBN 978-1-4081-0884-0. Verbelen, Phillippe (2010). "Asian enigma. First field observations...3 KB (266 words) - 14:44, 25 October 2023
Feathers. 3: 390–391. König, Claus; Weick, Friedhelm; Jan-Hendrik Becking (2009). Owls of the World. Bloomsbury Publishing. p. 217. ISBN 978-1-4081-0884-0....4 KB (511 words) - 07:10, 13 April 2024- the World. Helm Identification Guides. A&C Black. pp. 457–59. ISBN 978-1-4081-0884-0. Johnstone, R. E.; Darnell, J. C. (1997). "Description of a new subspecies...4 KB (375 words) - 23:17, 12 December 2023
Claus (2009). Owls of the World (2nd ed.). London: A & C Black. ISBN 978-1-4081-0884-0. OCLC 727647969. Hennessey, A. Bennett; Herzog, Sebastian K.; Sagot...11 KB (1,135 words) - 21:48, 2 May 2024
(2nd ed.). London: A & C Black, Christopher Helm. pp. 42–63. ISBN 978-1-4081-0884-0. Gwee, Chyi Yin; Christidis, Leslie; Eaton, James A.; Norman, Janette...46 KB (5,062 words) - 19:26, 11 April 2024
Jan-Hendrik (2009). Owls of the World. A&C Black. pp. 457–59. ISBN 9781408108840. Mayr, Ernst (1943). "Notes on Australian Birds (II)". Emu 43 (1): 3–17...6 KB (743 words) - 14:34, 17 March 2024
ISBN 978-1-4081-0884-0. König, Claus; Weick, Friedhelm; Becking, Jan-Hendrik (2009). Owls of the World. Bloomsbury Publishing. p. 209. ISBN 978-1-4081-0884-0...72 KB (7,883 words) - 14:34, 8 May 2024
Friedhelm (eds.). Owls of the World (2nd ed.). A&C Black. pp. 42–63. ISBN 9781408108840. Gwee, Chyi Yin; Christidis, Les; Eaton, James A.; Norman, Janette A...18 KB (1,986 words) - 05:11, 29 March 2024
Jan-Hendrik (2009). Owls of the World. A. C. Black. pp. 366–368. ISBN 9781408108840. https://ebird.org/checklist/S154949141 https://www.aba...7 KB (913 words) - 16:51, 2 December 2023
(2008). Owls of the World (2nd ed.). London: Christopher Helm. ISBN 9781408108840. Weick, Friedhelm (2007). Owls (Strigiformes): Annotated and Illustrated...3 KB (347 words) - 14:30, 25 October 2022
Jan-Hendrik (2009). Owls of the World. Bloomsbury Publishing. p. 209. ISBN 978-1-4081-0884-0. Gmelin, Johann Friedrich (1788). Systema naturae per regna tria naturae :...29 KB (3,473 words) - 21:48, 13 August 2023- Friedhelm (eds.). Owls of the World (2nd ed.). A&C Black. pp. 42–63. ISBN 9781408108840. "Owls – IOC World Bird List". Retrieved 2022-08-24. Higgins 1999, p...4 KB (351 words) - 18:01, 7 November 2023
(2009). Owls of the World. Bloomsbury Publishing. pp. 46–48. ISBN 978-1-4081-0884-0. Owls of the World: A Photographic Guide by Mikkola, H. Firefly Books...33 KB (3,943 words) - 21:48, 29 December 2023
the World (Second ed.). London: Christopher Helm. pp. Plate 37. ISBN 9781408108840. Sody, H. J. V. (1989). "Unpublished manuscripts of H. J. V. Sody: Diets...15 KB (1,995 words) - 03:30, 18 June 2023
(2008). Owls of the World (2nd ed.). London: Christopher Helm. ISBN 9781408108840. Weick, F. (2007). Owls (Strigiformes): annotated and illustrated checklist...11 KB (1,366 words) - 22:40, 30 January 2023
(2008). Owls of the World (2nd ed.). London: Christopher Helm. ISBN 9781408108840. Jeyarajasingam, A. (2012). A field guide to the birds of Peninsular...10 KB (1,431 words) - 05:07, 5 September 2023
(2008). Owls of the World (2nd ed.). London: Christopher Helm. ISBN 9781408108840. "Owl pages: Ninox strenua". Retrieved 24 May 2020. Hollands, David...27 KB (3,401 words) - 01:48, 13 March 2024
(2008). Owls of the World (2nd ed.). London: Christopher Helm. ISBN 9781408108840. Weick, F. (2007). Owls (Strigiformes): annotated and illustrated checklist...15 KB (2,130 words) - 11:55, 25 October 2023
(2008). Owls of the World (Second ed.). London: Christopher Helm. ISBN 9781408108840. Voous, K.H. 1988. Owls of the Northern Hemisphere. The MIT Press, 0262220350...15 KB (2,096 words) - 20:22, 21 December 2023
Guides (Second ed.). London: Christopher Helm. p. 343, Plate 38. ISBN 9781408108840. Voous, K. H. (1989). Owls of the Northern Hemisphere (Illustrated,...29 KB (3,610 words) - 18:27, 27 February 2024
