Crystal, D. (2004). The Penguin book of facts. New York: Penguin Books.
Trích dẫn kiểu ChicagoCrystal, David. The Penguin Book of Facts. New York: Penguin Books, 2004.
MLA引文Crystal, David. The Penguin Book of Facts. New York: Penguin Books, 2004.
警告：這些引文格式不一定是100％准確.