Não informado. (1978). Rural Development Perspectives. U.S. Department of Agriculture, Economics, Statistics and Cooperative Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Rural Development Perspectives. Washington: U.S. Department of Agriculture, Economics, Statistics and Cooperative Service, 1978.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Rural Development Perspectives. U.S. Department of Agriculture, Economics, Statistics and Cooperative Service, 1978.
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