Não informado. (1954). Index of Current Research on Pigs. Commonwealth Agricultural Bureau.
Lua i Stíl Chicago (17ú heag.)Não informado. Index of Current Research on Pigs. Wallingford, Inglaterra: Commonwealth Agricultural Bureau, 1954.
Lua MLA (8ú heag.)Não informado. Index of Current Research on Pigs. Commonwealth Agricultural Bureau, 1954.
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