@BOOK {ATTERE:1991, title = {Crop genetic resources of Africa: vol. I}, editor = {Attere, F. H. and Zedan, H. and Ng, N. Q. and Perrino, P. }, year = {1991}, volume = {1}, publisher = {IBPGR; UNEP; Ineternational Institute of Tropical Agriculture (IITA); CNR}, note = {331p. Available from IITA, Ibadan}, }