APA (7th ed.) Citation

Spence, J. (1992). Nations: A survey of the twentieth century. Oxford University Press.

Chicago Style (17th ed.) Citation

Spence, J.E. Nations: A Survey of the Twentieth Century. Oxford: Oxford University Press, 1992.

MLA (9th ed.) Citation

Spence, J.E. Nations: A Survey of the Twentieth Century. Oxford University Press, 1992.