The washington post writer's group. (1991). Messages: The washington post media companion. Allyn and bacon.
Cita Chicago (17th ed.)The washington post writer's group. Messages: The Washington Post Media Companion. Boston: Allyn and bacon, 1991.
Cita MLA (9th ed.)The washington post writer's group. Messages: The Washington Post Media Companion. Allyn and bacon, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.