APA (7th ed.) Citation

Schwering, E., & Adenauer, M. (1956). Köln. Strache.

Chicago Style (17th ed.) Citation

Schwering, Ernst, and Max Adenauer. Köln. Stuttgart: Strache, 1956.

MLA (8th ed.) Citation

Schwering, Ernst, and Max Adenauer. Köln. Strache, 1956.