@book{18046,
	author = {Delgado, Christopher L.},
	title = {An invertigation of the lack of mixed farming in the west african savannh, a farming systems approach for Tenkodogo, Upper Volta},
	publisher = {University of Michigan. Center for Research on Economic Development,},
	year = {1978},
	series = {Discussion paper},
	address = {An Arbor, Mich. :}
}