Gaya APA

Keefe, P, J. (). The method of Paul Tillich's theological system. Excerpta ex disserttione P.U.G. . Roma: 1967.

Gaya MLA

Keefe, P.Donaldus, J.. "The method of Paul Tillich's theological system. Excerpta ex disserttione P.U.G. ". Roma: 1967, . Buku.