Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.