Rijksmuseum [online] (2000-) http://www.rijksmuseum.nl/aria/aria_assets/AK-MAK-1117?lang=en&context_space=&context_id=; www.rijksmuseum.nl/collectie/AK-MAK-1117; accessed 9 October 2012
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World Biographical Information System (2011-) accessed 9 October 2012 |