https://www.ourwarwickshire.org.uk/content/article/exceedingly-rare-lute-hans-frei-bologna

https://carmentis.kmkg-mrah.be/eMP/eMuseumPlus?service=ExternalInterface&module=collection&objectId=109699&viewType=detailView&lang=nl

https://www.mimo-international.com/MIMO/search.aspx?SC=DEFAULT&QUERY=frei#/Detail/(query:(Id:'4_OFFSET_0',Index:5,NBResults:5,PageRange:3,SearchQuery:(CloudTerms:!(),ForceSearch:!t,Page:0,PageRange:3,QueryString:edlinger,ResultSize:15,ScenarioCode:DEFAULT,ScenarioDisplayMode:display-mosaic,Search

https://carmentis.kmkg-mrah.be/eMP/eMuseumPlus?service=ExternalInterface&module=collection&objectId=109225&viewType=detailView&lang=nl

https://museumcollections.rcm.ac.uk/collection/Details/collect/1194RCM 26: Chitarrone by Magnus Tieffenbrucker, Venice, 1608 Stringing 6 x 2, 8 x 1. Body length 679.5 mm. String lengths 933 mm approx and 1700 mm approx.