Peirce, Charles S. Collected papers, 1931-1958:‏ volume 1, title page (Charles Hartshorne)‏

Stanford encyclopedia of philosophy, viewed online on October 9, 2015‏ (Charles Hartshorne; philosopher of religion; metaphysician; born in Kittanning, Pennsylvania, June 5, 1897; died in Austin, Texas, October 9, 2000; taught at the University of Chicago from 1928 to 1955 and at Emory University from 1955 to 1962, when he moved to the University of Texas)