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WikiPedia: Sẻ_nhà http://books.google.com/?id=J-UUAAAAIAAJ http://books.google.com/books?id=2IwMAAAAYAAJ http://books.google.com/books?id=_2hJAAAAYAAJ http://ibc.lynxeds.com/species/house-sparrow-passe... http://elibrary.unm.edu/sora/Wilson/v109n03/p0539-... http://www.birds.kz/species.php?species=691&l=en http://www.birds.kz/species.php?species=692&l=en http://www.ibercajalav.net/img/419_HouseSparrowP._... http://www.allaboutbirds.org/guide/House_Sparrow/i... http://www.archive.org/details/cu31924022537298