James Gregory Sources

"James Gregory." Gregory Biography. N.p., n.d. Web. 28 Sept. 2012. <http://www-groups.dcs.st-and.ac.uk/history/Biographies/Gregory.html>.

 

"James Gregory (Scottish Mathematician and Astronomer)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 28 Sept. 2012. <http://www.britannica.com/EBchecked/topic/245544/James-Gregory>.