Kok, Richard (13 February 2006). "Sterkok Royer verrast met vertrek" [Star chef Royer surprises by leaving]. Misset Horeca (in Dutch). Retrieved 25 October 2014. (subscription required)
Kok, Richard (13 February 2006). "Sterkok Royer verrast met vertrek" [Star chef Royer surprises by leaving]. Misset Horeca (in Dutch). Retrieved 25 October 2014. (subscription required)