APA Style

Gottschalk, C, (. et al (c2000). Ozonation of water and waste water: a practical guide to understanding ozone and its application . gw: WILEY-VCH.

MLA Style

Gottschalk, C., (Christiane). et al. "Ozonation of water and waste water: a practical guide to understanding ozone and its application". gw: WILEY-VCH, c2000. Computer File.