@book{20308,
	author = {Jefferson, Thomas A. and Webber, Marc A. and ebrary, Inc.},
	title = {Marine mammals of the world},
	publisher = {Elsevier,},
	year = {c2008.},
	address = {Amsterdam :},
	note = {Two columns to the page.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10276401}
}