APA (7th ed.) Citation

United States. Postmaster General. (1923). First aid for postal employees. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. First Aid for Postal Employees. Washington: U.S. GPO, 1923.

MLA (9th ed.) Citation

United States. Postmaster General. First Aid for Postal Employees. U.S. GPO, 1923.

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