Robert Farren, PIE culture words collection, 2017
Rubattu, Antoninu (2001-2003). Dizionario universale della lingua di Sardegna: italiano-sardo-italiano, antico e moderno : con i corrispondenti in inglese, francese, spagnolo, tedesco. Sassari: EDES
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When the etymological tree is displayed in hierarchical style, the nodes can be repositioned manually only within their level.
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This map shows the etymological links in a geographic context.