APA

United States, . (1989). Significant incidents of political violence against Americans. Washington, DC: U.S. Dept. of State, Bureau of Diplomatic Security.

Chicago

United States, . 1989. Significant incidents of political violence against Americans. Washington, DC: U.S. Dept. of State, Bureau of Diplomatic Security.

Harvard

United States, . (1989). Significant incidents of political violence against Americans. Washington, DC: U.S. Dept. of State, Bureau of Diplomatic Security.

MLA

United States, . Significant incidents of political violence against Americans. Washington, DC: U.S. Dept. of State, Bureau of Diplomatic Security. 1989.