@book{9989,
	author = {Robison, Daniel M. and McKean, Sheila J.},
	title = {Shifting cultivation and alternatives :},
	publisher = {C.A.B. International in association with CIAT, Centro Internacional de Agricultura Tropical,},
	year = {c1992.},
	address = {Wallingford, U.K. :},
	note = {Includes index.}
}