@book{96117,
	author = {Rees, Eileen C. and ebrary, Inc.},
	title = {Bewick's swan},
	publisher = {T & A D Poyser,},
	year = {2006.},
	series = {Poyser monographs},
	address = {London :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10395814}
}