Cita APA (7a ed.)

Roesdahl, E., Williams, K., & Margeson, S. M. (1998). The Vikings (Second Edition.). Penguin Books.

Cita Chicago Style (17a ed.)

Roesdahl, Else, Kirsten Williams, y Susan M. Margeson. The Vikings. Second Edition. London: Penguin Books, 1998.

Cita MLA (9a ed.)

Roesdahl, Else, et al. The Vikings. Second Edition. Penguin Books, 1998.