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.
Citação do estilo Chicago (17ª ed.)United States. Postmaster General, United States. National Archives and Records Service, e 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.
Citação MLA (8ª ed.)United States. Postmaster General, et al. Letters Sent by the Postmaster General, 1789-1836. National Archives and Records Service, General Services Administration, 1965.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.