E. A. Overgaauw  <br />The writing speed of Herman of Amsterdam, Carthusian in Utrecht,  in: E. A. Overgaauw (ed.), Fast or slow, professional or monastic. The writing speed of some late-medieval scribes, Bruxelles, 1995, 222-227 (= Scriptorium. International review of manuscript studies, 49)<br />[Overgaauw 1995]