APA-Zitierstil (7. Ausg.)

(1988). The magnetic field in the United States, 1985: Vertical intensity chart. U.S. Geological Survey.

Chicago-Zitierstil (17. Ausg.)

The Magnetic Field in the United States, 1985: Vertical Intensity Chart. Denver, CO u.a: U.S. Geological Survey, 1988.

MLA-Zitierstil (9. Ausg.)

The Magnetic Field in the United States, 1985: Vertical Intensity Chart. U.S. Geological Survey, 1988.