APA (7th ed.) Citation

United States. Post Office Department. (1923). Use of precanceled stamps on holiday mail. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Post Office Department. Use of Precanceled Stamps on Holiday Mail. [Washington]: [publisher not identified], 1923.

MLA (9th ed.) Citation

United States. Post Office Department. Use of Precanceled Stamps on Holiday Mail. [publisher not identified], 1923.

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