APA (7th ed.) Citation

Beck, L., & Speidel, H. (1955). Studien. Koehler.

Chicago Style (17th ed.) Citation

Beck, Ludwig, and Hans Speidel. Studien. Stuttgart: Koehler, 1955.

MLA (8th ed.) Citation

Beck, Ludwig, and Hans Speidel. Studien. Koehler, 1955.