Philosophers Speak of God, by Charles Hartshorne and William L. Reese (Chicago: University of Chicago Press, 1953.) Reprinted by Humanity Books (Amherst, N.Y., 2000 with an addendum to the preface by William L. Reese.) This volume offers a presentation and critique of the primary idea in the history of ideas East and West, theistic and atheistic.
Process Studies, Journal of the Center for Process Studies, Claremont, California. “Special Focus on Charles Hartshorne,” volume 30.2, 2001, contains the most recent primary bibliography of Hartshorne’s philosophical works.
Dictionary of Philosophy and Religion: Eastern and Western Thought by William L. Reese (Atlantic Highlands, N.J.; Humanities Press, 1980; new and enlarged edition, 1996). The classic one-volume work, 856 pages.
Dancing with the Sacred: Evolution, Ecology, and God by Karl E. Peters (Harrisburg, PA: Trinity Press, International, 2002). Library Journal recommends this description of the new world of power, which can be read online.