@BOOK {HAHN:1995, title = {Production of yams: present role and future prospects: IITA research guide, No. 46}, author = {Hahn, S. K. and Osiru, D. and Akoroda, M. and Otoo, J. }, series = {IITA research guide, No. 46}, year = {1995}, month = {March}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {RTB; Root and Tuber; Yam.; 35p.}, }