- Author: Karl A. E. Enenkel, Christine Göttler
- Language: English
- Year: 2018
- Author: Karl A. E. Enenkel, Anita Traninger
- Language: English
- Year: 2015
- Author: Karl A.E. Enenkel
- Language: German
- Year: 2008
- Author: Karl A. E. Enenkel
- Language: English
- Year: 2019
- Author: Ilia Leonard Pfeijffer Karl A. E. Enenkel
- Language: English
- Year: 2004
- Author: Jan Frans van Dijkhuizen, Karl A.E. Enenkel
- Language: English
- Year: 2008
- Author: Karl A E Enenkel, Anita Traninger
- Language: English
- Year: 2018
- Author: Jan Frans van Dijkhuizen Karl A.E. Enenkel
- Language: English
- Year: 2009