Zundert, J. van. & Kegel, P. Charting Hermans (beta). The Hague: Huygens Institute for the History of the Netherlands. http://protected-inlet-2605.herokuapp.com/

Zundert, J. van. & Andrews, T.L. Stemmaweb. Bern: Univeristy of Bern, 2013. http://stemmaweb.net/stemmaweb/

Zundert, J. van. Delta3D. The Hague: Huygens Institute for the History of the Netherlands, 2011. http://eccentricity.org/delta3d/