APA (7th ed.) Citation

United States. Hydrographic Office. (1909). Sun's apparent declination and equation of time: 1909 (beginning with Apr.). GPO.

Chicago Style (17th ed.) Citation

United States. Hydrographic Office. Sun's Apparent Declination and Equation of Time: 1909 (beginning with Apr.). [Washington]: GPO, 1909.

MLA (9th ed.) Citation

United States. Hydrographic Office. Sun's Apparent Declination and Equation of Time: 1909 (beginning with Apr.). GPO, 1909.

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