Duncan Druce. "August Wilhelmj". CHASE: Collection of Historical Annotated String Editions. University of Leeds School of Music. Archived from the original on 2 April 2015. Retrieved 25 March 2015.
Duncan Druce. "August Wilhelmj". CHASE: Collection of Historical Annotated String Editions. University of Leeds School of Music. Archived from the original on 2 April 2015. Retrieved 25 March 2015.