APA (7th ed.) Citation

Otto, E. (1940). Friedrich Barbarossa. Akademische Verlagsgesellschaft Athenaion.

Chicago Style (17th ed.) Citation

Otto, Eberhard. Friedrich Barbarossa. Potsdam: Akademische Verlagsgesellschaft Athenaion, 1940.

MLA (9th ed.) Citation

Otto, Eberhard. Friedrich Barbarossa. Akademische Verlagsgesellschaft Athenaion, 1940.

Warning: These citations may not always be 100% accurate.