United States. Postmaster General. (1908). Advertisement inviting proposals for carrying mails of U.S. in State of Pennsylvania, from July 1, 1909 to June 30, 1913. GPO.
Chicago Style (17th ed.) CitationUnited States. Postmaster General. Advertisement Inviting Proposals for Carrying Mails of U.S. in State of Pennsylvania, from July 1, 1909 to June 30, 1913. [Washington]: GPO, 1908.
MLA (9th ed.) CitationUnited States. Postmaster General. Advertisement Inviting Proposals for Carrying Mails of U.S. in State of Pennsylvania, from July 1, 1909 to June 30, 1913. GPO, 1908.
Warning: These citations may not always be 100% accurate.