"Postcodetool for 3371AL". Actueel Hoogtebestand Nederland (به هلندی). Het Waterschapshuis. Archived from the original on 21 September 2013. Retrieved 26 July 2013.
"Collegeleden" [Members of the board] (به هلندی). Gemeente Hardinxveld-Giessendam. Archived from the original on 10 May 2013. Retrieved 26 July 2013.
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"Collegeleden" [Members of the board] (به هلندی). Gemeente Hardinxveld-Giessendam. Archived from the original on 10 May 2013. Retrieved 26 July 2013.
"Postcodetool for 3371AL". Actueel Hoogtebestand Nederland (به هلندی). Het Waterschapshuis. Archived from the original on 21 September 2013. Retrieved 26 July 2013.