@BOOK {NWEKE:1991, title = {Production costs in the yam-based cropping systems of southeastern Nigeria: RCMP research monograph, No. 6}, author = {Nweke, F. and Ugwu, B. and Asadu, C. * and Ay, P. }, booktitle = {RCMP research monograph, No. 6}, year = {1991}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {RTB; Root and Tuber; Yam.; 29p.}, } |