N.G.GREGORY. (2007). Animal Welfare Meat Production (2nd edn.). Cabi.
Chicago Style aipamenaN.G.GREGORY. Animal Welfare Meat Production. 2nd edn. USA: Cabi, 2007.
MLA aipamenaN.G.GREGORY. Animal Welfare Meat Production. 2nd edn. Cabi, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.