
- 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: Claus Borgnakke Richard E. Sonntag
- Language: English
- Year: 2009

- Author: Claus Borgnakke Richard E. Sonntag Gordon J. Van Wylen
- Language: English
- Year: 2008