Vennerstrøm, S., & World Data Center A for Solar-Terrestrial Physics. (1994). Geomagnetic polar cap (PC) index, 1975-1993. World Data Center A for Solar-Terrestrial Physics, National Geophysical Data Center.
Chicago Style (17th ed.) CitationVennerstrøm, S., and World Data Center A for Solar-Terrestrial Physics. Geomagnetic Polar Cap (PC) Index, 1975-1993. Boulder, CO: World Data Center A for Solar-Terrestrial Physics, National Geophysical Data Center, 1994.
MLA (8th ed.) CitationVennerstrøm, S., and World Data Center A for Solar-Terrestrial Physics. Geomagnetic Polar Cap (PC) Index, 1975-1993. World Data Center A for Solar-Terrestrial Physics, National Geophysical Data Center, 1994.
Warning: These citations may not always be 100% accurate.