reference
Alfred Holder
Alt-Celtischer Sprachschatz U-Z
ISBN-13 Online: 978-3-7001-6067-0
Subject Area: Prehistory
approbated - online

reference
Alfred Holder
Alt-Celtischer Sprachschatz I-T
ISBN-13 Online: 978-3-7001-6066-3
Subject Area: Prehistory
approbated - online

reference
Alfred Holder
Alt-Celtischer Sprachschatz A-H
ISBN-13 Online: 978-3-7001-6055-7
Subject Area: Prehistory
approbated - online