Não informado. (1971). British farmer and stockbreeder. National Farmers Union.
Lua i Stíl Chicago (17ú heag.)Não informado. British Farmer and Stockbreeder. London: National Farmers Union, 1971.
Lua MLA (8ú heag.)Não informado. British Farmer and Stockbreeder. National Farmers Union, 1971.
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