"Kostbare vergissing Tesnière". Leidsch Dagblad (in Dutch). Regionaal Archief Leiden. 20 July 1979. p. 9. Archived from the original on 8 October 2012. Retrieved 13 April 2013.
"Kostbare vergissing Tesnière". Leidsch Dagblad (in Dutch). Regionaal Archief Leiden. 20 July 1979. p. 9. Archived from the original on 8 October 2012. Retrieved 13 April 2013.