Cita APA (7a ed.)

Doyle, J. (1901). Magnetical dip and declination in the Philippine islands Brief notice of the same. Manila Central Observatory.

Cita Chicago Style (17a ed.)

Doyle, John. Magnetical Dip and Declination in the Philippine Islands Brief Notice of the Same. Manila: Manila Central Observatory, 1901.

Cita MLA (9a ed.)

Doyle, John. Magnetical Dip and Declination in the Philippine Islands Brief Notice of the Same. Manila Central Observatory, 1901.