- Author: Universelles Leben e.V., Kugler Hans-Günter, Schneider Arno
- Language: German
- Year: 2014
- Author: Buchhalter Mayoori, Stolze Raasti
- Language: German
- Year: 2012
- Author: Cavelius Anna, Ilies Angelika, Pape Detlef
- Language: German
- Year: 2013
- Author: Winston J Craig(Editor)
- Language: English
- Year: 2018