Não informado. (1978). Rural Development Perspectives. U.S. Department of Agriculture, Economics, Statistics and Cooperative Service.
Chicago-referens (17:e uppl.)Não informado. Rural Development Perspectives. Washington: U.S. Department of Agriculture, Economics, Statistics and Cooperative Service, 1978.
MLA-referens (8:e uppl.)Não informado. Rural Development Perspectives. U.S. Department of Agriculture, Economics, Statistics and Cooperative Service, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.