APA (7th ed.) Citation

United States. Postmaster General. (1917). Christmas Post Office Notice No. 1. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Postmaster General. Christmas Post Office Notice No. 1. [Place of publication not identified]: [publisher not identified], 1917.

MLA (9th ed.) Citation

United States. Postmaster General. Christmas Post Office Notice No. 1. [publisher not identified], 1917.

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