APA (7th ed.) Citation

Pörtner, R. (1973). Die Wikinger-Saga. Bertelsmann [u.a.].

Chicago Style (17th ed.) Citation

Pörtner, Rudolf. Die Wikinger-Saga. Gütersloh: Bertelsmann [u.a.], 1973.

MLA (9th ed.) Citation

Pörtner, Rudolf. Die Wikinger-Saga. Bertelsmann [u.a.], 1973.

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