APA (7th ed.) Citation

United States. Post Office Department. (1919). Schedule of steamers appointed to convey U.S. mails to foreign countries during month of , 1919. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Post Office Department. Schedule of Steamers Appointed to Convey U.S. Mails to Foreign Countries During Month of , 1919. [Washington]: [publisher not identified], 1919.

MLA (9th ed.) Citation

United States. Post Office Department. Schedule of Steamers Appointed to Convey U.S. Mails to Foreign Countries During Month of , 1919. [publisher not identified], 1919.