Não informado. (1964). Bulletin of Rural Economics and Sociology. University of Ibadan, Department of Agricultural Economics and Extension.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of Rural Economics and Sociology. Ibadan, Nigeria: University of Ibadan, Department of Agricultural Economics and Extension, 1964.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of Rural Economics and Sociology. University of Ibadan, Department of Agricultural Economics and Extension, 1964.
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