APA (7th ed.) Citation

United States. National Archives and Records Administration. (1943). U.S. Army prepares for invasion of Europe [etc.]. National Archives and Records Administration.

Chicago Style (17th ed.) Citation

United States. National Archives and Records Administration. U.S. Army Prepares for Invasion of Europe [etc.]. [Washington, D.C.]: National Archives and Records Administration, 1943.

MLA (9th ed.) Citation

United States. National Archives and Records Administration. U.S. Army Prepares for Invasion of Europe [etc.]. National Archives and Records Administration, 1943.