@book{240,
	author = {Cock, James (ed.) and Macintyre, Reginald (ed.)},
	title = {Proceedings of the Fourth Symposium of the Interanational Society for Tropical Root Crops},
	publisher = {International Development Research Center},
	year = {1977},
	address = {Box 8500, Ottawa, Canada K1G 3H9}
}