Clarke, A. C. (1968). The promise of space. New York: Harper & Row.
Trích dẫn kiểu ChicagoClarke, Arthur C. The Promise of Space. New York: Harper & Row, 1968.
MLA引文Clarke, Arthur C. The Promise of Space. New York: Harper & Row, 1968.
警告：這些引文格式不一定是100％准確.