Fontaine, Piet F.M. (2006). "Radical Reformation - Dutch Sacramentists". The Light and the Dark: A cultural history of dualism. Vol. 23: Postlutheran Reformation I. Utrecht: Gopher Publishers. Archived from the original on 2011-05-25.
Fontaine, Piet F.M. (2006). "Radical Reformation - Dutch Sacramentists". The Light and the Dark: A cultural history of dualism. Vol. 23: Postlutheran Reformation I. Utrecht: Gopher Publishers. Archived from the original on 2011-05-25.