APA (7th ed.) Citation

Heidegger, M., Jaspers, K., Biemel, W., & Saner, H. (1992). Briefwechsel: 1920-1963. Piper ; Vittorio Klostermann.

Chicago Style (17th ed.) Citation

Heidegger, Martin, Karl Jaspers, Walter Biemel, and Hans Saner. Briefwechsel: 1920-1963. München : Frankfurt am Main: Piper ; Vittorio Klostermann, 1992.

MLA (9th ed.) Citation

Heidegger, Martin, et al. Briefwechsel: 1920-1963. Piper ; Vittorio Klostermann, 1992.