APA (7th ed.) Citation

Stein, E., Conrad-Martius, H., & Conrad-Martius, H. (1960). Briefe an Hedwig Conrad-Martius. Kösel.

Chicago Style (17th ed.) Citation

Stein, Edith, Hedwig Conrad-Martius, and Hedwig Conrad-Martius. Briefe an Hedwig Conrad-Martius. München: Kösel, 1960.

MLA (8th ed.) Citation

Stein, Edith, et al. Briefe an Hedwig Conrad-Martius. Kösel, 1960.