"Gregory (More Correctly Gregorie), James." Complete Dictionary of Scientific Biography. Vol. 5. Detroit: Charles Scribner's Sons, 2008. 524-530. Gale Virtual Reference Library. Web. 30 Sept. 2010.
"James Gregory." MacTutor History of Mathematics. JOC/EFR, Sept. 2000. Web. 30 Sept. 2010. <http://www-history.mcs.st-and.ac.uk/Biographies/Gregory.html>.
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