United States. Postmaster General. (1906). Advertisement inviting proposals for carrying mails of U.S. in State of Michigan, from July 1, 1907 to June 30, 1911. GPO.
Chicago Style (17th ed.) CitationUnited States. Postmaster General. Advertisement Inviting Proposals for Carrying Mails of U.S. in State of Michigan, from July 1, 1907 to June 30, 1911. [Washington]: GPO, 1906.
MLA (9th ed.) CitationUnited States. Postmaster General. Advertisement Inviting Proposals for Carrying Mails of U.S. in State of Michigan, from July 1, 1907 to June 30, 1911. GPO, 1906.
Warning: These citations may not always be 100% accurate.