APA (7th ed.) Citation

Simpson, J. (1980). The Viking world (1. publ.). St. Martin's Press.

Chicago Style (17th ed.) Citation

Simpson, Jacqueline. The Viking World. 1. publ. New York: St. Martin's Press, 1980.

MLA (9th ed.) Citation

Simpson, Jacqueline. The Viking World. 1. publ. St. Martin's Press, 1980.