Clarke, W. M. (1967). The city in the world economy. London: Penguin.
Trích dẫn kiểu ChicagoClarke, William M. The City in the World Economy. London: Penguin, 1967.
MLA引文Clarke, William M. The City in the World Economy. London: Penguin, 1967.
警告：這些引文格式不一定是100％准確.