APA (7th ed.) Citation

Schulte, L., & Möllenbeck, T. (2020). Vorwort. Frieden, 9-12.

Chicago Style (17th ed.) Citation

Schulte, Ludger, and Thomas Möllenbeck. "Vorwort." Frieden 2020: 9-12.

MLA (9th ed.) Citation

Schulte, Ludger, and Thomas Möllenbeck. "Vorwort." Frieden, 2020, pp. 9-12.

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