@book{12408,
	author = {Billings, W. D.},
	title = {Plants, man, and the ecosystem /},
	publisher = {Wadsworth Pub. Co. ,},
	year = {1972},
	series = {Fundamentals of botany series},
	address = {Belmont, Calif. :},
	edition = {2nd ed.},
	note = {First and 3d ed. published under title: Plants and the ecosystem.}
}