James Clackson 2015
A number of ancient European and Ancient Near Eastern languages are not listed in E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27. One of them is Umbrian ( Robert von Planta 1897 ).
Glottolog
[xum] at ISO 639-3
[xum] at OLAC
[xum] at IMTVault
Wikidata
Wikipedia