Ratzinger, J. (1982). Theologische Prinzipienlehre: Joseph Kardinal Ratzinger. Wewel.
Cita Chicago (17th ed.)Ratzinger, Joseph. Theologische Prinzipienlehre: Joseph Kardinal Ratzinger. München: Wewel, 1982.
Cita MLA (8th ed.)Ratzinger, Joseph. Theologische Prinzipienlehre: Joseph Kardinal Ratzinger. Wewel, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.