Cita APA (7th ed.)
Ash, R. (2007). Whitaker's world of facts. Penguin Books.
Cita Chicago (17th ed.)
Ash, Russell. Whitaker's World of Facts. New Delhi: Penguin Books, 2007.
Cita MLA (9th ed.)
Ash, Russell. Whitaker's World of Facts. Penguin Books, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.