Não informado. (1964). Bulletin of Rural Economics and Sociology. University of Ibadan, Department of Agricultural Economics and Extension.
Citace podle Chicago (17th ed.)Não informado. Bulletin of Rural Economics and Sociology. Ibadan, Nigeria: University of Ibadan, Department of Agricultural Economics and Extension, 1964.
Citace podle MLA (8th ed.)Não informado. Bulletin of Rural Economics and Sociology. University of Ibadan, Department of Agricultural Economics and Extension, 1964.
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