Barr, N. (2020). Economics of the Welfare State (6.). Oxford University Press.
芝加哥风格引文Barr, Nicholas. Economics of the Welfare State. 6. UK: Oxford University Press, 2020.
MLA引文Barr, Nicholas. Economics of the Welfare State. 6. Oxford University Press, 2020.
警告：这些引文格式不一定是100％准确.