Fuente: Interview with Jack Eddy, April 21, 1999: In Michigan by phone, conducted by Spencer Weart http://www.agu.org/history/sv/solar/eddy_int.html
John A. Eddy: Frases en inglés
Fuente: Eddy, J.A., "The Maunder Minimum", Science 18 June 1976: Vol. 192. no. 4245, pp. 1189 - 1202 http://www.sciencemag.org/cgi/content/citation/192/4245/1189, PDF Copy http://bill.srnr.arizona.edu/classes/182h/Climate/Solar/Maunder%20Minimum.pdf
Fuente: Changing Sun, Changing Climate? by Spencer Weart http://www.aip.org/history/climate/solar.htm#M_27_
Fuente: "The Case of the Missing Sunspots"; Scientific American, May 1977, volume 236, issue 5, pages 80-92
Fuente: NASA EOS Project Science Office: The Earth Observer January/February 2004, Vol. 16, No. 1 http://eospso.gsfc.nasa.gov/eos_observ/pdf/Jan-Feb04.pdf, Page 4
Fuente: The Sun: A Biography by David Whitehouse, page 225.