एपीए उद्धरण

Crystal, D. (2004). The Penguin book of facts. London, England ; New York, N.Y., USA: Penguin.

शिकागो स्टाइल उद्धरण

Crystal, David. The Penguin Book of Facts. London, England ; New York, N.Y., USA: Penguin, 2004.

एमएलए उद्धरण

Crystal, David. The Penguin Book of Facts. London, England ; New York, N.Y., USA: Penguin, 2004.