De Jasay, A. (1989). Social contract, free ride: A study of the public goods problem. Clarendon Press.
芝加哥风格引文De Jasay, Anthony. Social Contract, Free Ride: A Study of the Public Goods Problem. Oxford: Clarendon Press, 1989.
MLA引文De Jasay, Anthony. Social Contract, Free Ride: A Study of the Public Goods Problem. Clarendon Press, 1989.
警告：这些引文格式不一定是100％准确.