Papi, U. (1969). Eco. problems of agriculture in industrial societies. Macmillan.
Lua i Stíl Chicago (17ú heag.)Papi, U. Eco. Problems of Agriculture in Industrial Societies. London: Macmillan, 1969.
Lua MLA (9ú heag.)Papi, U. Eco. Problems of Agriculture in Industrial Societies. Macmillan, 1969.
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