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
* |Carboneras, Carles (1992): Family Anatidae (Ducks, Geese and Swans). ''en:'' |del Hoyo, Josep; Elliott, Andrew & Sargatal, Jordi (eds.): ''[[Handbook of Birds of the World]]'' (Volume 1: Ostrich to Ducks): 536-629, plates 40-50. Lynx Edicions, Barcelona. <small>ISBN 84-87334-10-5</small>
* 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]