APA (7th ed.) Citation

United States. Hydrographic Office. (1917). International code of signals, American edition. GPO.

Chicago Style (17th ed.) Citation

United States. Hydrographic Office. International Code of Signals, American Edition. [Washington]: GPO, 1917.

MLA (9th ed.) Citation

United States. Hydrographic Office. International Code of Signals, American Edition. GPO, 1917.

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