Schäfer, G. (1997). Schäfer. Schäfer.
Cita Chicago (17th ed.)Schäfer, Gerhard. Schäfer. Berlin: Schäfer, 1997.
Cita MLA (8th ed.)Schäfer, Gerhard. Schäfer. Schäfer, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)