APA (7th ed.) Citation

Khedivial Observatory (Helwan). (1912). Magnetic observations made during 1911 at the Khedivial Observatory, Helwan. Gov. press.

Chicago Style (17th ed.) Citation

Khedivial Observatory (Helwan). Magnetic Observations Made During 1911 at the Khedivial Observatory, Helwan. Cairo: Gov. press, 1912.

MLA (9th ed.) Citation

Khedivial Observatory (Helwan). Magnetic Observations Made During 1911 at the Khedivial Observatory, Helwan. Gov. press, 1912.

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