APA (7th ed.) Citation

United States. Post Office Department & ProQuest (Firm). (1858). Letter from the Postmaster General, communicating an abstract of offers for carrying the mails during the year ending July 1, 1857; also, a report of all contracts for transportation of the mails, &c. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Post Office Department and ProQuest (Firm). Letter from the Postmaster General, Communicating an Abstract of Offers for Carrying the Mails During the Year Ending July 1, 1857; Also, a Report of All Contracts for Transportation of the Mails, &c. Washington: [publisher not identified], 1858.

MLA (9th ed.) Citation

United States. Post Office Department and ProQuest (Firm). Letter from the Postmaster General, Communicating an Abstract of Offers for Carrying the Mails During the Year Ending July 1, 1857; Also, a Report of All Contracts for Transportation of the Mails, &c. [publisher not identified], 1858.