1
Publicado 1990
“...International Institute of Tropical Agriculture, Ibadan (Nigeria)...”
Libro
2
Publicado 2001
“...International Institute of Tropical Agriculture, Ibadan (Nigeria)...”
Libro
3
Publicado 1999
“...International Institute of Tropical Agriculture; Ibadan (Nigeria)...”
Libro
4
Publicado 2003
“...International Institute of Tropical Agriculture, Ibadan (Nigeria)...”
Libro
5
Publicado 2000
“...FAO, Roma (Italia)International Institute of Tropical Agriculture, Ibadan (Nigeria)...”
Libro