Ganso de testa branca: Diferenzas entre revisións
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Liña 36:
* Madsen, J., G. Cracknell & Tony Fox (1999): Goose Populations of the Western Palearchtic, Wetlands International, Wageningen.
* Rutschke, E. (1997): Wildgänse Lebensweise - Schutz - Nutzung, Parey, Berlin
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* Fox, A.D. & Stroud, D.A. (2002): Greenland White-fronted Goose. ''Birds of the Western Palearctic Update'' '''4'''(2): 65-88.
* Littlejohn, Chase (1916): Some unusual records for San Mateo County, California. Abstract en: Cooper Ornithological Society|Cooper Club: Minutes of Cooper Club Meetings. ''Condor (journal)'' '''18'''(1): 38-40. [http://elibrary.unm.edu/sora/Condor/files/issues/v018n01/p0038-p0040.pdf PDF fulltext] [http://elibrary.unm.edu/sora/Condor/files/DJVU/v018n01/P0038-P0040.djvu DjVu fulltext]
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