Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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