APA引文

Freeman, C. (1974). The economics of industrial innovation. London: Penguin Books.

Trích dẫn kiểu Chicago

Freeman, Christopher. The Economics of Industrial Innovation. London: Penguin Books, 1974.

MLA引文

Freeman, Christopher. The Economics of Industrial Innovation. London: Penguin Books, 1974.

警告：這些引文格式不一定是100％准確.