APA (7th ed.) Citation

United States. Postmaster General. (1921). Retirement. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Postmaster General. Retirement. Washington: [publisher not identified], 1921.

MLA (9th ed.) Citation

United States. Postmaster General. Retirement. [publisher not identified], 1921.

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