@book{7156,
	author = {Brock, James P. and Kaufman, Kenn.},
	title = {Butterflies of North America },
	publisher = {Houghton Mifflin,},
	year = {c2003.},
	address = {New York, N.Y. :},
	url = {http://www.loc.gov/catdir/samples/hm051/2002027622.html}
}