1. [n.d.]. collective.documentviewer. https://github.com/collective/collective. documentviewer. [n.d.]. collective.documentviewer. https://github.com/collective/collective. documentviewer.
2. [n.d.]. The NYTimes Document Viewer. https://github.com/documentcloud/ document-viewer. [n.d.]. The NYTimes Document Viewer. https://github.com/documentcloud/ document-viewer.
3. [n.d.]. viewerjs. https://github.com/webodf/ViewerJS. [n.d.]. viewerjs. https://github.com/webodf/ViewerJS.
4. [n.d.]. web-document-viewer. https://github.com/Atalasoft/web-documentviewer. [n.d.]. web-document-viewer. https://github.com/Atalasoft/web-documentviewer.
5. [n.d.]. zathura. https://github.com/pwmt/zathura. [n.d.]. zathura. https://github.com/pwmt/zathura.