APA (7th ed.) Citation

Keck, T., & Keck, T. (1991). Materialien. Winter.

Chicago Style (17th ed.) Citation

Keck, Thomas, and Thomas Keck. Materialien. Heidelberg: Winter, 1991.

MLA (8th ed.) Citation

Keck, Thomas, and Thomas Keck. Materialien. Winter, 1991.

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