APA (7th ed.) Citation

Khedivial Observatory (Helwan). (1911). Magnetic observations made during 1910 at the Khedivial Observatory, Helwan. National Printing Dep.

Chicago Style (17th ed.) Citation

Khedivial Observatory (Helwan). Magnetic Observations Made During 1910 at the Khedivial Observatory, Helwan. Cairo: National Printing Dep, 1911.

MLA (9th ed.) Citation

Khedivial Observatory (Helwan). Magnetic Observations Made During 1910 at the Khedivial Observatory, Helwan. National Printing Dep, 1911.

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