APA (7th ed.) Citation

United States. Post Office Department & ProQuest (Firm). (1831). Post office contracts, 1830. Letter from the Postmaster General, transmitting a statement of the contracts made by the Department during the year 1830. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Post Office Department and ProQuest (Firm). Post Office Contracts, 1830. Letter from the Postmaster General, Transmitting a Statement of the Contracts Made by the Department During the Year 1830. Washington: [publisher not identified], 1831.

MLA (9th ed.) Citation

United States. Post Office Department and ProQuest (Firm). Post Office Contracts, 1830. Letter from the Postmaster General, Transmitting a Statement of the Contracts Made by the Department During the Year 1830. [publisher not identified], 1831.