@BOOK {NG:1991d, title = {Crop genetic resources of Africa}, author = {Ng, N. Q. and Perrino, P. and Attere, F. H. and Zedan, H. }, year = {1991}, volume = {II}, publisher = {International Institute of Tropical Agriculture (IITA); IBPGR; UNEP; CNR}, address = {Italy; Ibadan, Nigeria}, note = {350 pp}, }