"Postcodetool for 9861AC". Actueel Hoogtebestand Nederland (in Dutch). Het Waterschapshuis. Archived from the original on 21 September 2013. Retrieved 21 January 2014.
"College van b en w" [Council of mayor and aldermen] (in Dutch). Gemeente Grootegast. Archived from the original on 2 February 2014. Retrieved 21 January 2014.
web.archive.org
"College van b en w" [Council of mayor and aldermen] (in Dutch). Gemeente Grootegast. Archived from the original on 2 February 2014. Retrieved 21 January 2014.
"Postcodetool for 9861AC". Actueel Hoogtebestand Nederland (in Dutch). Het Waterschapshuis. Archived from the original on 21 September 2013. Retrieved 21 January 2014.