APA (7th ed.) Citation

United States. Postmaster General. (1923). New 12-cent, 30-cent, 2 and 5 postage stamps, series of 1922-23. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Postmaster General. New 12-cent, 30-cent, 2 and 5 Postage Stamps, Series of 1922-23. Washington: [publisher not identified], 1923.

MLA (9th ed.) Citation

United States. Postmaster General. New 12-cent, 30-cent, 2 and 5 Postage Stamps, Series of 1922-23. [publisher not identified], 1923.