APA (7th ed.) Citation

United States. Postmaster General. (1906). U.S. Postal Service, domestic and foreign mail matter: Classification, conditions, rates of postage, 2nd edition. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Postmaster General. U.S. Postal Service, Domestic and Foreign Mail Matter: Classification, Conditions, Rates of Postage, 2nd Edition. [Washington]: [publisher not identified], 1906.

MLA (9th ed.) Citation

United States. Postmaster General. U.S. Postal Service, Domestic and Foreign Mail Matter: Classification, Conditions, Rates of Postage, 2nd Edition. [publisher not identified], 1906.