van Dijk, R.  (2003).  Toward Imageless Contemplation. Gerard Zerbolt of Zutphen as Guide for Lectio Divina. In H.  Blommestijn, Caspers, C. M. A., & Hofman, R. (Red.), Spirituality renewed. Studies on Significant Representatives of the Modern Devotion (Vol. 10, pp. 3-28). Leuven: Peeters.