APA (7th ed.) Citation

Howard, M., & Louis, W. R. (1998). The Oxford history of the twentieth century. University Press.

Chicago Style (17th ed.) Citation

Howard, Michael, and William Roger Louis. The Oxford History of the Twentieth Century. Oxford [etc.]: University Press, 1998.

MLA (9th ed.) Citation

Howard, Michael, and William Roger Louis. The Oxford History of the Twentieth Century. University Press, 1998.