"Guy Pearce Exclusive Interview; Talks THE KING’S SPEECH, Luc Besson’s LOCKOUT, DON’T BE AFRAID OF THE DARK, More". Interview with Sheila Roberts, collider.com. April 9, 2012.
"A Tribute, Municipal Museum De Lakenhal Leiden, Municipal Museum Schiedam, Museum de Wieger". Book by Bram van Velde, Deurne, p. 44, Letter to H. E. Kramer, October 25, 1926, 1994.