Cita APA (7a ed.)

Merrill, R. T., & McElhinny, M. W. (1983). The Earth's magnetic field: Its history, origin, and planetary perspective. Academic Press.

Cita Chicago Style (17a ed.)

Merrill, Ronald T., y M. W. McElhinny. The Earth's Magnetic Field: Its History, Origin, and Planetary Perspective. London [etc.]: Academic Press, 1983.

Cita MLA (9a ed.)

Merrill, Ronald T., y M. W. McElhinny. The Earth's Magnetic Field: Its History, Origin, and Planetary Perspective. Academic Press, 1983.