"Ein Wagen der Linie 8" [A Carriage from Line 8]. volkssaengerei.de (in German). Retrieved 25 June 2017.
weiss-ferdl-schule.de
"Weiß-Ferdl-Mittelschule ... Lernen und Lachen" [Weiß Ferdl Middle School ... Learning and Laughing]. Weiß-Ferdl-Mittelschule (in German). Retrieved 27 November 2020. (as of November 2020, the homepage images include one showing the blue streetcar)