@book{976,
	author = {Thoman, Richard S. and Conkling, Edgar C.},
	title = {Geografía del comercio internacional.},
	publisher = {Vicens Vives, },
	year = {1972.},
	address = {Barcelona : },
	edition = {1ra.ed.},
	note = {Bibliografía p. 239-241.}
}