W3C: XForms 1.1 W3C Recommendation. 20 October 2009. https://www.w3.org/TR/xforms11/

XForms Users Community Group: XForms 2.0. https://www.w3.org/community/xformsusers/wiki/XForms_2.0

Alain Couthures: XSLTForms. GitHub repository. https://github.com/AlainCouthures/xsltforms

Alain Couthures: XSLTForms. SourceForge repository. https://sourceforge.net/projects/xsltforms/

Orbeon Forms. https://www.orbeon.com/

Webframe: Concept designs. used for demonstration. https://webframe.xyz/