Thomas, G. (1993). An introduction to ethics: Five central problems of moral judgement. G. Duckworth.
Lua i Stíl Chicago (17ú heag.)Thomas, Geoffrey. An Introduction to Ethics: Five Central Problems of Moral Judgement. London: G. Duckworth, 1993.
Lua MLA (9ú heag.)Thomas, Geoffrey. An Introduction to Ethics: Five Central Problems of Moral Judgement. G. Duckworth, 1993.
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