APA (7th ed.) Citation

United States. Postmaster General. (1922). Return cards on 1-cent special-request envelopes. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Postmaster General. Return Cards on 1-cent Special-request Envelopes. Washington: [publisher not identified], 1922.

MLA (9th ed.) Citation

United States. Postmaster General. Return Cards on 1-cent Special-request Envelopes. [publisher not identified], 1922.

Warning: These citations may not always be 100% accurate.