(1937). Siegfried: Am 25. September 1937 [Programmheft].
Cita Chicago (17th ed.)Siegfried: Am 25. September 1937 [Programmheft]. Magdeburg, 1937.
Cita MLA (8th ed.)Siegfried: Am 25. September 1937 [Programmheft]. 1937.
Atenció: Aquestes cites poden no estar 100% correctes.