Cita APA (7th ed.)

Morgenstern, C., & Morgenstern, C. (1979). Briefe, Essays. Piper.

Cita Chicago (17th ed.)

Morgenstern, Christian, i Christian Morgenstern. Briefe, Essays. München ; Zürich: Piper, 1979.

Cita MLA (8th ed.)

Morgenstern, Christian, i Christian Morgenstern. Briefe, Essays. Piper, 1979.

Atenció: Aquestes cites poden no estar 100% correctes.