Greylag goose (English Wikipedia)

"Greylag Goose ( Anser anser ) movements" (PDF). British Trust for Ornithology. Retrieved 24 October 2015. stated to be from Delany, S.; Veen, J.; Clark, J.A., eds. (2006). Urgent preliminary assessment of ornithological data relevant to the spread of Avian Influenza in Europe. Report to the European Commission. Study contract: 07010401/2005/425926/MAR/B4.

dofbasen.dk

BirdLife International (2018). "Anser anser". IUCN Red List of Threatened Species. 2018: e.T22679889A131907747. doi:10.2305/IUCN.UK.2018-2.RLTS.T22679889A131907747.en. Retrieved 15 February 2022.
Carnoneras, C. (2020). del Hoyo, J.; Elliott, A.; Sargatal, J.; Christie, D.A.; de Juana, E. (eds.). "Graylag Goose (Anser anser), version 1.0". Birds of the World. Ithaca, NY, USA: Cornell Lab of Ornithology. doi:10.2173/bow.gragoo.01. Retrieved 23 December 2023.
Podhrázský, M.; Musil, P.; Musilová, Z.; Zouhar, J.; Adam, M.; Závora, J.; Hudec, K. (2017). "Central European Greylag Geese Anser anser show a shortening of migration distance and earlier spring arrival over 60 years". Ibis. 159 (2): 352–365. doi:10.1111/ibi.12440.

Hugo, Susanne (2002). "Chapter 1: Origins and Breeds of Domestic Geese". In Buckland, Roger; Guy, Gérard (eds.). Geese: the underestimated species. Fao Animal Production and Health Paper. FAO Agriculture Department. ISSN 0254-6019.

Southey, I. (2013). Miskelly, C.M. (ed.). "Greylag goose". New Zealand Birds Online. Retrieved 24 October 2015.

Fort, Matthew (2010-09-23). "The golden goose". The Guardian. ISSN 0261-3077. Retrieved 2023-09-17.

Johnsgard, Paul A. (2010) [1978]. "Ducks, Geese, and Swans of the World". Ducks, Geese, and Swans of the World by Paul A. Johnsgard (revised online ed.). Lincoln, Nebraska: University of Nebraska Press.

"Domestic Geese". British Waterfowl Association. Archived from the original on 19 March 2016. Retrieved 2 June 2016.

"Domestic Geese". British Waterfowl Association. Archived from the original on 19 March 2016. Retrieved 2 June 2016.
Mitchell, Carl; Hearn, Richard; Stroud, David (4 September 2012). "The merging of populations of Greylag Geese breeding in Britain". British Birds. Archived from the original on 23 February 2014. Retrieved 17 November 2013.
"Greylag goose (Anser anser)". Wildscreen Arkive. Archived from the original on 2013-06-22. Retrieved 20 October 2015.

Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2023). "Screamers, ducks, geese & swans". IOC World Bird List Version 13.2. International Ornithologists' Union. Retrieved 23 December 2023.

Hugo, Susanne (2002). "Chapter 1: Origins and Breeds of Domestic Geese". In Buckland, Roger; Guy, Gérard (eds.). Geese: the underestimated species. Fao Animal Production and Health Paper. FAO Agriculture Department. ISSN 0254-6019.
Yan, Ming; Yi, Kunpeng; Zhang, Junjian; Batbayar, Nyambayar; Xu, Zhenggang; Liu, Guanhua; Hu, Binhua; Zheng, Bofu; Antonov, Aleksei; Goroshko, Oleg; Zhao, Gerelt; Davaasuren, Batmunkh; Erdenechimeg, Tuvshinjargal; Nergui, Jugdernamjil; Damba, Iderbat (2020). "Flyway connectivity and population status of the Greylag Goose Anser anser in East Asia". Wildfowl: 157–180. ISSN 2052-6458.
Fort, Matthew (2010-09-23). "The golden goose". The Guardian. ISSN 0261-3077. Retrieved 2023-09-17.

Yan, Ming; Yi, Kunpeng; Zhang, Junjian; Batbayar, Nyambayar; Xu, Zhenggang; Liu, Guanhua; Hu, Binhua; Zheng, Bofu; Antonov, Aleksei; Goroshko, Oleg; Zhao, Gerelt; Davaasuren, Batmunkh; Erdenechimeg, Tuvshinjargal; Nergui, Jugdernamjil; Damba, Iderbat (2020). "Flyway connectivity and population status of the Greylag Goose Anser anser in East Asia". Wildfowl: 157–180. ISSN 2052-6458.