Willem de Vos Royal Netherlands Academy of Arts and Sciences, knaw.nl. Arkistoitu 11.2.2017. Viitattu 10.2.2017. (englanniksi)
narcis.nl
Person: Prof.dr. W.M. (Willem) de Vos NARCIS - National Academic Research and Collaborations Information System (Netherlands), narcis.nl. Viitattu 10.2.2017. (englanniksi)