APA (7th ed.) Citation

U.S. Coast and Geodetic Survey. (1917). Results of observations made at U.S. Coast and Geodetic Survey magnetic observatory at Sitka, Alaska, 1917 and 1918. GPO.

Chicago Style (17th ed.) Citation

U.S. Coast and Geodetic Survey. Results of Observations Made at U.S. Coast and Geodetic Survey Magnetic Observatory at Sitka, Alaska, 1917 and 1918. [Washington]: GPO, 1917.

MLA (9th ed.) Citation

U.S. Coast and Geodetic Survey. Results of Observations Made at U.S. Coast and Geodetic Survey Magnetic Observatory at Sitka, Alaska, 1917 and 1918. GPO, 1917.