- Author: Claus Borgnakke Richard E. Sonntag
- Language: English
- Year: 2021
- Author: Claus Borgnakke, Richard E. Sonntag
- Language: English
- Year: 2020
- Author: Claus Borgnakke Richard E. Sonntag
- Language: Portuguese
- Year: 2018
- Author: Claus Borgnakke Richard E. Sonntag
- Language: English
- Year: 2012
- Author: Claus Borgnakke Richard E. Sonntag
- Language: English
- Year: 2012
- Author: Claus Borgnakke Richard E. Sonntag
- Language: English
- Year: 2012
- Author: Richard E. Sonntag Claus Borgnakke Gordon J. Van Wylen
- Language: English
- Year: 1998
- Author: Claus Borgnakke Richard E. Sonntag
- Language: English
- Year: 2009
- Author: Richard E. Sonntag Claus Borgnakke Gordon J. Van Wylen
- Language: English
- Year: 2003