APA (7th ed.) Citation

United States. Hydrographic Office. (1909). International code of signals: American edition. GPO.

Chicago Style (17th ed.) Citation

United States. Hydrographic Office. International Code of Signals: American Edition. [Washington]: GPO, 1909.

MLA (9th ed.) Citation

United States. Hydrographic Office. International Code of Signals: American Edition. GPO, 1909.

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