@INBOOK {MANYONG:2001a, title = {Farmers' perceptions of, and actions on resource management constraints in the yam-based systems of western Nigeria}, author = {Manyong, V. and Asiedu, R. and Olaniyan, G. O. }, year = {2001}, type = {Root Crops in the 21st century: proccedings of the 7th Triennial Symposium of the International Society for Tropical Root Crops - Africa branch, IITA, Ibadan, Nigeria, Oct. 1998}, pages = {156--167}, publisher = {Government of Benin}, note = {RTB; Root and Tuber; Yam}, }