Cita APA (7a ed.)

Friis-Christensen, E. (1989). Ground magnetic perturbations in the polar cap and cleft: Relationship with the IMF. Danish Meteorological Institute.

Cita Chicago Style (17a ed.)

Friis-Christensen, Eigil. Ground Magnetic Perturbations in the Polar Cap and Cleft: Relationship with the IMF. Copenhagen: Danish Meteorological Institute, 1989.

Cita MLA (9a ed.)

Friis-Christensen, Eigil. Ground Magnetic Perturbations in the Polar Cap and Cleft: Relationship with the IMF. Danish Meteorological Institute, 1989.