APA (7th ed.) Citation

ScienceDirect (Online service) & Jacobs, J. A. (1991). Geomagnetism. Academic.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service) and J. A. Jacobs. Geomagnetism. [Place of publication not identified]: Academic, 1991.

MLA (9th ed.) Citation

ScienceDirect (Online service) and J. A. Jacobs. Geomagnetism. Academic, 1991.