APA

United States, . (2011). National emergency communications plan: urban area communications key findings and recommendations. [Washington, D.C.]: U.S. Department of Homeland Security.

Chicago

United States, . 2011. National emergency communications plan: urban area communications key findings and recommendations. [Washington, D.C.]: U.S. Department of Homeland Security.

Harvard

United States, . (2011). National emergency communications plan: urban area communications key findings and recommendations. [Washington, D.C.]: U.S. Department of Homeland Security.

MLA

United States, . National emergency communications plan: urban area communications key findings and recommendations. [Washington, D.C.]: U.S. Department of Homeland Security. 2011.