Pieper, J. (1971). Was unterscheidet den Priester? Kösel.
Citazione stile Chigago Style (17a edizione)Pieper, Josef. Was Unterscheidet Den Priester? München: Kösel, 1971.
Citatione MLA (8a ed.)Pieper, Josef. Was Unterscheidet Den Priester? Kösel, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.