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Jackson, Andrew; Jonkers, Art R. T.; Walker, Matthew R. (2000). "Four centuries of Geomagnetic Secular Variation from Historical Records". Philosophical Transactions of the Royal Society A. 358 (1768). ss. 957-990. Bibcode:2000RSPTA.358..957J. doi:10.1098/rsta.2000.0569. JSTOR2666741.
Usui, Yoichi; Tarduno, John A.; Watkeys, Michael; Hofmann, Axel; Cottrell, Rory D. (2009). "Evidence for a 3.45-billion-year-old magnetic remanence: Hints of an ancient geodynamo from conglomerates of South Africa". Geochemistry Geophysics Geosystems. 10 (9). Bibcode:2009GGG....1009Z07U. doi:10.1029/2009GC002496.
Tarduno, J. A.; Cottrell, R. D.; Watkeys, M. K.; Hofmann, A.; Doubrovine, P. V.; Mamajek, E. E.; Liu, D.; Sibeck, D. G.; Neukirch, L. P.; Usui, Y. (4 Mart 2010). "Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago". Science. 327 (5970). ss. 1238-1240. Bibcode:2010Sci...327.1238T. doi:10.1126/science.1183445. PMID20203044.
Jackson, Andrew; Jonkers, Art R. T.; Walker, Matthew R. (2000). "Four centuries of Geomagnetic Secular Variation from Historical Records". Philosophical Transactions of the Royal Society A. 358 (1768). ss. 957-990. Bibcode:2000RSPTA.358..957J. doi:10.1098/rsta.2000.0569. JSTOR2666741.
nasa.gov
core2.gsfc.nasa.gov
Frey, Herbert. "Satellite Magnetic Models". Comprehensive Modeling of the Geomagnetic Field. NASA. 4 Mart 2016 tarihinde kaynağından arşivlendi. Erişim tarihi: 13 Ekim 2011.
Tarduno, J. A.; Cottrell, R. D.; Watkeys, M. K.; Hofmann, A.; Doubrovine, P. V.; Mamajek, E. E.; Liu, D.; Sibeck, D. G.; Neukirch, L. P.; Usui, Y. (4 Mart 2010). "Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago". Science. 327 (5970). ss. 1238-1240. Bibcode:2010Sci...327.1238T. doi:10.1126/science.1183445. PMID20203044.
Frey, Herbert. "Satellite Magnetic Models". Comprehensive Modeling of the Geomagnetic Field. NASA. 4 Mart 2016 tarihinde kaynağından arşivlendi. Erişim tarihi: 13 Ekim 2011.