APA (7th ed.) Citation

Ullrich, V. (2017). Das offene Geheimnis. Zeit-Geschichte.

Chicago Style (17th ed.) Citation

Ullrich, Volker. "Das Offene Geheimnis." Zeit-Geschichte 2017.

MLA (8th ed.) Citation

Ullrich, Volker. "Das Offene Geheimnis." Zeit-Geschichte, 2017.

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