^"Tarifplan"(PDF). Hamburger Verkehrsverbund. 9 December 2018. Retrieved 18 October 2019.
^ ab"Merkenstraße". hamburger-untergrundbahn.de (in German). 5 August 2008. Archived from the original on 24 September 2015. Retrieved 20 October 2014.
^"Linienchronik". hochbahnbuch.de (in German). Retrieved 20 October 2014.