Não informado. (1993). International Poultry Production. Positive Action Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. International Poultry Production. Driffield, Inglaterra: Positive Action Publications, 1993.
Lua MLA (8ú heag.)Não informado. International Poultry Production. Positive Action Publications, 1993.
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