"Over de OBA". www.oba.nl (به هلندی). Openbare Bibliotheek Amsterdam. Archived from the original on 21 اكتبر 2018. Retrieved 20 October 2018. {{cite web}}: Check date values in: |archive-date= (help)
"Bestuursverslag 2015"(PDF). Openbare Bibliotheek Amsterdam. 18 May 2016. Archived from the original(PDF) on 15 December 2018. Retrieved 15 December 2018.
web.archive.org
"Over de OBA". www.oba.nl (به هلندی). Openbare Bibliotheek Amsterdam. Archived from the original on 21 اكتبر 2018. Retrieved 20 October 2018. {{cite web}}: Check date values in: |archive-date= (help)
"Bestuursverslag 2015"(PDF). Openbare Bibliotheek Amsterdam. 18 May 2016. Archived from the original(PDF) on 15 December 2018. Retrieved 15 December 2018.