APA (7th ed.) Citation

Duncan, E. M. (1990). Visits abroad of the Presidents of the United States, 1906-1989. U.S. Dept. of State, Office of the Historian, Bureau of Public Affairs.

Chicago Style (17th ed.) Citation

Duncan, Evan M. Visits Abroad of the Presidents of the United States, 1906-1989. [Washington, D.C.?]: U.S. Dept. of State, Office of the Historian, Bureau of Public Affairs, 1990.

MLA (9th ed.) Citation

Duncan, Evan M. Visits Abroad of the Presidents of the United States, 1906-1989. U.S. Dept. of State, Office of the Historian, Bureau of Public Affairs, 1990.