APA (7th ed.) Citation

United States. National Archives and Records Service. Office of Records Management. (1955). Plain letters.

Chicago Style (17th ed.) Citation

United States. National Archives and Records Service. Office of Records Management. Plain Letters. Washington, D.C, 1955.

MLA (8th ed.) Citation

United States. National Archives and Records Service. Office of Records Management. Plain Letters. 1955.

Warning: These citations may not always be 100% accurate.