(1955). Gesammelte Werke. Diederichs.
Cita Chicago (17th ed.)Gesammelte Werke. Düsseldorf: Diederichs, 1955.
Cita MLA (8th ed.)Gesammelte Werke. Diederichs, 1955.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)