APA (7th ed.) Citation

Richards, J. D. (2005). The Vikings: A very short introduction. Oxford University Press.

Chicago Style (17th ed.) Citation

Richards, J. D. The Vikings: A Very Short Introduction. Oxford ; New York: Oxford University Press, 2005.

MLA (9th ed.) Citation

Richards, J. D. The Vikings: A Very Short Introduction. Oxford University Press, 2005.