"Postcodetool for 1648JG". Actueel Hoogtebestand Nederland (in Dutch). Het Waterschapshuis. Archived from the original on 21 September 2013. Retrieved 12 March 2014.
archive.today
"College van B&W" [Board of mayor and aldermen] (in Dutch). Gemeente Koggenland. Archived from the original on 12 March 2014. Retrieved 12 March 2014.
"College van B&W" [Board of mayor and aldermen] (in Dutch). Gemeente Koggenland. Archived from the original on 12 March 2014. Retrieved 12 March 2014.
web.archive.org
"Postcodetool for 1648JG". Actueel Hoogtebestand Nederland (in Dutch). Het Waterschapshuis. Archived from the original on 21 September 2013. Retrieved 12 March 2014.