- Author: Koch Industries, Koch Charles de Ganahl, Koch David H, Leonard Christopher
- Language: English
- Year: 2019
- Author: Koch Industries, Koch Charles de Ganahl, Koch David H, Leonard Christopher
- Language: English
- Year: 2019
- Author: Petra Koch-David Link
- Language: German
- Year: 2016
- Author: Sigmund Koch, David E Leary
- Language: English
- Year: 1985
- Author: Andrew Campbell Richard Koch David Sadtler
- Language: English
- Year: 2000