@book {8500,
	title = {Sunflower species of the United States},
	year = {1982},
	month = {1982///},
	publisher = {National Sunflower Association, Bismarck},
	organization = {National Sunflower Association, Bismarck},
	author = {C.E. Rogers and T.E. Thompson and G.J. Seiler}
}
