APA (7th ed.) Citation

Canal Zone. (1922). Ships' schedule signals: Canal, at locks, Balboa Harbor, Cristobal Harbor; international code, northbound and southbound courses. Panama Canal Press.

Chicago Style (17th ed.) Citation

Canal Zone. Ships' Schedule Signals: Canal, at Locks, Balboa Harbor, Cristobal Harbor; International Code, Northbound and Southbound Courses. [United States]: Panama Canal Press, 1922.

MLA (9th ed.) Citation

Canal Zone. Ships' Schedule Signals: Canal, at Locks, Balboa Harbor, Cristobal Harbor; International Code, Northbound and Southbound Courses. Panama Canal Press, 1922.