- Author: Ummels Michael
- Language: English
- Year: 2010
- Author: Martina S. Vos
- Language: English
- Year: 2009
- Author: Michael Ummels
- Language: English
- Year: 2010
- Author: Chris Heunen
- Language: English
- Year: 2009
- Author: Michael Ummels
- Language: English
- Year: 2010
- Author: Godfried Engbersen Jos de Haan (redactie).
- Language: Dutch
- Year: 2007
- Author: Anne van Wageningen Jack-Jan Wirken.
- Language: Dutch
- Year: 2005
- Author: Lotte Hollands
- Language: English
- Year: 2009