APA (7th ed.) Citation

Koch, H., Wassilieff, W., & Zimmermann, K. Grau-Eule. Progress.

Chicago Style (17th ed.) Citation

Koch, H., W. Wassilieff, and Kurt Zimmermann. Grau-Eule. Moskau: Progress.

MLA (8th ed.) Citation

Koch, H., et al. Grau-Eule. Progress.