@book{69171,
	author = {Ross, Robert M.},
	title = {Causes of evolution :},
	publisher = {University of Chicago Press,},
	year = {1990.},
	address = {Chicago :},
	note = {"This volume originated in a student-run seminar series in 'Earth History and Paleobiology' held at Harvard University in the spring of 1987"--Pref.}
}