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- Gregg Miner and Kelly Williams (July 2011). Selecting the Term. Fretless Zithers.
It describes terminology and taxonomy of the "Fretless Zither" family instruments.
- Kelly Williams (May 11, 2003). Background of the Guitar-Zither. The Guitar-Zither Clearinghouse.
It describes terminology on similar terms as below:
- "Guitar-Zither" (patented by Fred Menzenhauer in 1894)
- "Chorded zither" (referred Autoharp without trademark infringement with Oscar Schmidt International),
This category has the following 5 subcategories, out of 5 total.