@BOOK {MANYONG:2006d, title = {Achievements in impact assessment of agricultural research: IITA experience, 2001-2006}, author = {Manyong, V. and Alene, A. and Sanogo, D. and Coulibaly, O. and Abele, S. and Nkamleu, G. B. }, series = {IMPACT}, year = {2006}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, isbn = {978-131-292-0}, }