APA (7th ed.) Citation

Spengler, O., Schröter, M., & Koktanek, A. M. (1963). Briefe 1913-1936. Beck.

Chicago Style (17th ed.) Citation

Spengler, Oswald, Manfred Schröter, and Anton M. Koktanek. Briefe 1913-1936. Munich: Beck, 1963.

MLA (8th ed.) Citation

Spengler, Oswald, et al. Briefe 1913-1936. Beck, 1963.