Petri, D. (1969). Was uns letztlich angeht: Das Unbedingte in der philosophischen Theologie Paul Tillichs.
Citazione stile Chigago Style (17a edizione)Petri, Dieter. Was Uns Letztlich Angeht: Das Unbedingte in Der Philosophischen Theologie Paul Tillichs. 1969.
Citatione MLA (8a ed.)Petri, Dieter. Was Uns Letztlich Angeht: Das Unbedingte in Der Philosophischen Theologie Paul Tillichs. 1969.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.