- Author: Arnold Huijgen, Karin Maag
- Language: English
- Year: 2020
- Author: Jean-François Gilmont, Karin Maag
- Language: English
- Year: 2005
- Author: Karin Maag
- Language: English
- Year: 1997
- Author: Jean-François Gilmont translated by Karin Maag
- Language: English
- Year: 2016
- Author: Lyle D. Bierma, Charles D. Gunnoe Jr., Karin Maag
- Language: English
- Year: 2005