Webster, B. Valverde, C. Fletcher, A.
The IFARD Brasilia Declaration, 1986 The impact of research on national agricultural development - The Hague (Países Bajos) ISNAR 1987 - p. 263-264
The IFARD Brasilia Declaration, 1986 The impact of research on national agricultural development - The Hague (Países Bajos) ISNAR 1987 - p. 263-264