United States. Postmaster General, United States. National Archives and Records Service, & United States. Post Office Dept. (1965). Letters sent by the Postmaster General, 1789-1836. National Archives and Records Service, General Services Administration.
Citace podle Chicago (17th ed.)United States. Postmaster General, United States. National Archives and Records Service, a United States. Post Office Dept. Letters Sent by the Postmaster General, 1789-1836. Washington, D.C.: National Archives and Records Service, General Services Administration, 1965.
Citace podle MLA (8th ed.)United States. Postmaster General, et al. Letters Sent by the Postmaster General, 1789-1836. National Archives and Records Service, General Services Administration, 1965.
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