@book{12223,
	author = {Williamson, Harold Francis and Daum, Arnold},
	title = {The American petroleum industry},
	publisher = {Northwestern University Press},
	year = {1959.},
	series = {Northwestern University Studies in business history.},
	address = {Evanston, Ill.},
	note = {Vol. 2 by H. F. Williamson et al.}
}