"Thurau: etappetriomf, Haritz: dopinggebruik" [Thurau: stage victory, Haritz: used doping.]. Nieuwsblad van het Noorden (in Dutch). Delpher. 7 May 1976. p. 25. Retrieved 18 April 2017.
"Haritz stapt eruit" [Haritz quits.]. De Waarheid (in Dutch). Delpher. 10 May 1976. p. 4. Retrieved 18 April 2017.