- Author: Erhard S. Gerstenberger
- Language: English
- Year: 2001
- Author: Erhard S. Gerstenberger
- Language: German
- Year: 2022
- Author: Erhard S. Gerstenberger
- Language: English
- Year: 1996
- Author: Erhard S. Gerstenberger
- Language: English
- Author: Erhard S. Gerstenberger
- Language: English
- Year: 2001
- Author: Erhard S. Gerstenberger
- Language: English
- Year: 2002
- Author: Erhard S. Gerstenberger Siegfried S. Schatzmann
- Language: English
- Year: 2011
- Author: Mr. Erhard S. Gerstenberger
- Language: English
- Year: 2001