APA Style

Tillich, P. (1973). Systematic theology. Volume I, Reason and revelation, Being and God / Paul Tillich. (Vol. 1, Pbk. ed.). Chicago: The University of Chicago Press.

MLA Style

Tillich, P.. "Systematic theology. Volume I, Reason and revelation, Being and God / Paul Tillich.". Vol. 1, Pbk. ed. Chicago: The University of Chicago Press, 1973. Text.