APA (7th ed.) Citation

Ludwig, E., Paul, E., & Paul, C. (1927). Bismarck: The story of a fighter. Blue Ribbon Books.

Chicago Style (17th ed.) Citation

Ludwig, Emil, Eden Paul, and Cedar Paul. Bismarck: The Story of a Fighter. New York: Blue Ribbon Books, 1927.

MLA (9th ed.) Citation

Ludwig, Emil, et al. Bismarck: The Story of a Fighter. Blue Ribbon Books, 1927.