B. Koerner, Deutsches Geschlechterbuch 100, Görlitz 1938, S. 98 f. http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=maerker&id=I245 http://www.groen-breukelman.nl/files/0%20desc-thoebrockel.htm (Nr. 19)