APA (7th ed.) Citation

United States. National Archives and Records Service. (1963). Indexes to letters received by the Secretary of War, 1861-70. National Archives and Records Service.

Chicago Style (17th ed.) Citation

United States. National Archives and Records Service. Indexes to Letters Received by the Secretary of War, 1861-70. Washington: National Archives and Records Service, 1963.

MLA (8th ed.) Citation

United States. National Archives and Records Service. Indexes to Letters Received by the Secretary of War, 1861-70. National Archives and Records Service, 1963.

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