- Author: Claus Grupen Mark Rodgers
- Language: English
- Year: 2016
- Author: Jan I. Lelley
- Language: German
- Year: 2018
- Author: William McGucken
- Language: English
- Year: 1991
- Author: Marianne Sommer
- Language: English
- Year: 2016
- Author: Chris D. Thomas
- Language: English
- Year: 2017
- Author: Patricia Mangione
- Language: English
- Year: 1996
- Author: John L. Smellie Benjamin R. Edwards
- Language: English
- Year: 2016
- Author: John Hogue
- Language: English
- Year: 2017
- Author: Elizabeth Yale
- Language: English
- Year: 2016