- Author: Carol Engelhardt-Herringer
- Language: English
- Year: 2013
- Author: Engelhardt Werner W.
- Language: German
- Year: 2001
- Author: Engelhardt Florian
- Language: German
- Year: 2010
- Author: Engelhardt Henriette
- Language: German
- Year: 2002
- Author: Engelhardt Werner H.
- Language: German
- Year: 1960