APA (7th ed.) Citation

(1920). Ephemeris of Sun and Polaris and tables of azimuths and altitudes of Polaris for year 1921. GPO.

Chicago Style (17th ed.) Citation

Ephemeris of Sun and Polaris and Tables of Azimuths and Altitudes of Polaris for Year 1921. [Washington]: GPO, 1920.

MLA (9th ed.) Citation

Ephemeris of Sun and Polaris and Tables of Azimuths and Altitudes of Polaris for Year 1921. GPO, 1920.

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