Washington Post Writers Group. (1991). Messages: The Washington Post media companion. Allyn and Bacon.
Cita Chicago (17th ed.)Washington Post Writers Group. Messages: The Washington Post Media Companion. Boston: Allyn and Bacon, 1991.
Cita MLA (8th ed.)Washington Post Writers Group. Messages: The Washington Post Media Companion. Allyn and Bacon, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.