Norman, D. W. (1981). Farm and village production systems in the semi-arid tropics of West Africa: An interpretive review of research. International Crops Research Institute for the Semi-arid Tropics.
Chicago-referens (17:e uppl.)Norman, David. W. Farm and Village Production Systems in the Semi-arid Tropics of West Africa: An Interpretive Review of Research. Andhra Pradesh, India: International Crops Research Institute for the Semi-arid Tropics, 1981.
MLA-referens (9:e uppl.)Norman, David. W. Farm and Village Production Systems in the Semi-arid Tropics of West Africa: An Interpretive Review of Research. International Crops Research Institute for the Semi-arid Tropics, 1981.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.