Part I originally published as 'Religionsphilosophie d. Kultur'. Frankfurt-am-Main, 1919. Part 2 originally published in 'Gesammelte Werke'. Stuttgart: Evangelisches Verlagswerk, 1959-
What is religion? by Paul Tillich. ISBN 0060682493. Published by Harper & Row in 1969. Publication and catalogue information, links to buy online and reader comments.