Cita APA (7a ed.)

(1909). Principal facts of the Earth's magnetism: And methods of determining the true meridian and the magnetic declination. Government Printing Office.

Cita Chicago Style (17a ed.)

Principal Facts of the Earth's Magnetism: And Methods of Determining the True Meridian and the Magnetic Declination. Washington: Government Printing Office, 1909.

Cita MLA (9a ed.)

Principal Facts of the Earth's Magnetism: And Methods of Determining the True Meridian and the Magnetic Declination. Government Printing Office, 1909.