Cita APA

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

Citación estilo Chicago

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

Cita MLA

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