United States. Shipping Board. (1917). Instructions which must be followed by licensed officers of all U.S. merchant vessels traversing submarine zone. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Shipping Board. Instructions Which Must Be Followed by Licensed Officers of All U.S. Merchant Vessels Traversing Submarine Zone. Washington: U.S. GPO, 1917.
MLA (9th ed.) CitationUnited States. Shipping Board. Instructions Which Must Be Followed by Licensed Officers of All U.S. Merchant Vessels Traversing Submarine Zone. U.S. GPO, 1917.
Warning: These citations may not always be 100% accurate.