Cita APA (7a ed.)

Khedivial Observatory (Helwan). (1914). Magnetic observations made during 1913 at the Khedivial Observatory, Helwan. Gov. press.

Cita Chicago Style (17a ed.)

Khedivial Observatory (Helwan). Magnetic Observations Made During 1913 at the Khedivial Observatory, Helwan. Cairo: Gov. press, 1914.

Cita MLA (9a ed.)

Khedivial Observatory (Helwan). Magnetic Observations Made During 1913 at the Khedivial Observatory, Helwan. Gov. press, 1914.