(2004). Brigitte Waldach: Schwarze Löcher.
Cita Chicago (17th ed.)Brigitte Waldach: Schwarze Löcher. Berlin, 2004.
Cita MLA (8th ed.)Brigitte Waldach: Schwarze Löcher. 2004.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)