This article is based upon a translation of the German language version as at May 2010.

The lead section of this article is based upon a translation of the Italian language version as at January 2011.

The rest of the article is based upon a translation of part of the Polish language version, and is currently a work in progress.

Parts of this article are based upon a translation of the equivalent article in the Spanish Wikipedia.

This article is based upon a translation of the equivalent article in the French Wikipedia.

This article is based upon a translation of part of the corresponding article from the French Wikipedia.

Where inline citations are absent, this article is based upon a translation of the Italian language version as at July 2011.

This entry is based in part upon a translation of the entry to Jules Romains in the French Wikipedia (translated on October 22, 2007).

This article is based upon a translation of the Spanish language version, and of part of the German Wikipedia article Trolleybus Solingen, as at September 2011.

This article is based upon a translation of the Italian language version.