Cita APA (7a ed.)
Ferguson, R. (2009). The Vikings: A History (1st Edition.). Penguin Books.
Cita Chicago Style (17a ed.)
Ferguson, Robert. The Vikings: A History. 1st Edition. New York: Penguin Books, 2009.
Cita MLA (9a ed.)
Ferguson, Robert. The Vikings: A History. 1st Edition. Penguin Books, 2009.
Precaución: Estas citas no son 100% exactas.