APA (7th ed.) Citation

Heidegger, M., Jaspers, K., Biemel, W., & Saner, H. (1990). Briefwechsel: : 1920-1963. Vittorio Klostermann.

Chicago Style (17th ed.) Citation

Heidegger, Martin, Karl Jaspers, Walter Biemel, and Hans Saner. Briefwechsel: : 1920-1963. Frankfurt: Vittorio Klostermann, 1990.

MLA (9th ed.) Citation

Heidegger, Martin, et al. Briefwechsel: : 1920-1963. Vittorio Klostermann, 1990.