APA (7th ed.) Citation

United States. Department of State. Bureau of Indexes and Archives & United States. Department of State. Division of Communications and Records. (1939). Classification of correspondence (4th. ed., Nov. 1, 1938.). G.P.O..

Chicago Style (17th ed.) Citation

United States. Department of State. Bureau of Indexes and Archives and United States. Department of State. Division of Communications and Records. Classification of Correspondence. 4th. ed., Nov. 1, 1938. Washington, D.C.: G.P.O., 1939.

MLA (9th ed.) Citation

United States. Department of State. Bureau of Indexes and Archives and United States. Department of State. Division of Communications and Records. Classification of Correspondence. 4th. ed., Nov. 1, 1938. G.P.O., 1939.