APA (7th ed.) Citation

Krzizek, R. (2008). Umweltzone Ruhrgebiet. Brockmeyer.

Chicago Style (17th ed.) Citation

Krzizek, Raphael. Umweltzone Ruhrgebiet. Bochum: Brockmeyer, 2008.

MLA (9th ed.) Citation

Krzizek, Raphael. Umweltzone Ruhrgebiet. Brockmeyer, 2008.

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