Cita APA (7a ed.)

ebrary, Inc, Brown, J. M., Louis, W. R., & Low, A. M. (1999). The twentieth century. Oxford University Press.

Cita Chicago Style (17a ed.)

ebrary, Inc, Judith M. Brown, William Roger Louis, y Alaine M. Low. The Twentieth Century. Oxford: Oxford University Press, 1999.

Cita MLA (9a ed.)

ebrary, Inc, et al. The Twentieth Century. Oxford University Press, 1999.