APA ציטוט

Crystal, D. (2004). The Penguin book of facts. New York: Penguin Books.

Trích dẫn kiểu Chicago

Crystal, David. The Penguin Book of Facts. New York: Penguin Books, 2004.

ציטוט MLA

Crystal, David. The Penguin Book of Facts. New York: Penguin Books, 2004.