Links to websites
The Commonwealth War Graves Commission refers to oorlogsgraven in Oegstgeest
The Oorlogsgravenstichting refers to oorlogsgraven in Oegstgeest
Website Vliegveld Valkenburg mei 1940 yields a detailed account of soldiers fallen on 10th May 1940, including Klaassens en Niemeijer.
A detailed account of the air attack on the Postbrug is contained in VerhaalBusbombardementDickBreedijk.