Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Mainzer Akademie der Wissenschaften und der Literatur und der Akademie der Wissenschaften zu Göttingen (2010). Mittelhochdeutschen Wörterbuch Online [online]. Available at: http://www.mhdwb-online.de/index.html
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.