Washington Post Writers Group. (1991). Messages: The Washington Post media companion. Allyn and Bacon.
Citazione stile Chigago Style (17a edizione)Washington Post Writers Group. Messages: The Washington Post Media Companion. Boston: Allyn and Bacon, 1991.
Citatione MLA (8a ed.)Washington Post Writers Group. Messages: The Washington Post Media Companion. Allyn and Bacon, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.