APA (7th ed.) Citation

Thoma, L., Waldau, G., & Grassinger, P. Heilige Nacht.

Chicago Style (17th ed.) Citation

Thoma, Ludwig, Gustav Waldau, and Peter Grassinger. Heilige Nacht.

MLA (9th ed.) Citation

Thoma, Ludwig, et al. Heilige Nacht.

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