| Citation | Birdlife International 2016 Greylag goose Anser anser. Birdlife International. http://www.birdlife.org/datazone/species/factsheet/22679889 [Accessed 5/5/2016]. |
| DOI / ISBN | |
| Paper URL | |
| Ref. No. | 107894 |
| Language | English |
| Usage | used in part |
| Remarks | |
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