Thomas, G. (1993). An introduction to ethics: Five central problems of moral judgement. G. Duckworth.
芝加哥风格引文Thomas, Geoffrey. An Introduction to Ethics: Five Central Problems of Moral Judgement. London: G. Duckworth, 1993.
MLA引文Thomas, Geoffrey. An Introduction to Ethics: Five Central Problems of Moral Judgement. G. Duckworth, 1993.
警告：这些引文格式不一定是100％准确.