Christopher, J. (2000). Return to earth. Oxford: Oxford Univ. Press.
Trích dẫn kiểu ChicagoChristopher, John. Return to Earth. Oxford: Oxford Univ. Press, 2000.
MLA引文Christopher, John. Return to Earth. Oxford: Oxford Univ. Press, 2000.
警告：這些引文格式不一定是100％准確.