BURKHART, F. N. (1991). Media Emergency Warnings And Citizen Response Ford N. Burkhart. Westview.
Lua i Stíl Chicago (17ú heag.)BURKHART, Ford N. Media Emergency Warnings And Citizen Response Ford N. Burkhart. Westview, 1991.
Lua MLA (8ú heag.)BURKHART, Ford N. Media Emergency Warnings And Citizen Response Ford N. Burkhart. Westview, 1991.
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