@book{87976,
	author = {Williams, Paul H.},
	title = {Bumble bees of North America :},
	publisher = {Princeton University Press,},
	year = {2014.},
	address = {Princeton, New Jersey ;},
	note = {Includes index.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10835340}
}