n     Bentley, Molly: “Earth Loses It’s Magnetism” http://newsvote.bbc.co.uk/mpapps/pagetools/print/news.bbc.co.uk/2/hi/science/nature/3359555.stm. December 2003.

n     British Geological Survey: “In The News: Magnetic Flip” http://www.geomag.bgs.ac.uk/reversals.html. 2007.

n     Britt, Robert Roy: “When North Becomes South: New Clues to Earth’s Magnetic Flip-flops” http://www.space.com/scienceastronomy/earth_poles_040407.html. April 2004.

n     Geological Survey of Canada: “Geomagnetism: Magnetic Reversals” http://cgc.rncan.gc.ca/geomag/nmp/reversals_e.php. 2007.

n     U.S. Geological Survey: “Frequently Asked Questions” http://geomag.usgs.gov/faqs.php. 2007.

n     Watson, J.M.: “Developing The Theory” http://pubs.usgs.gov/gip/dynamic/developing.html. 1999.

n     Watson, J.M.: “Magnetic Stripes and Isotopic Clocks” http://pubs.usgs.gov/gip/dynamic/stripes.html. 1999.