Washington Post Writers Group. (1991). Messages: The Washington Post media companion. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Washington Post Writers Group. Messages: The Washington Post Media Companion. Boston: Allyn and Bacon, 1991.
Lua MLA (8ú heag.)Washington Post Writers Group. Messages: The Washington Post Media Companion. Allyn and Bacon, 1991.
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