Robert Beekes (with the assistance of Lucien van Beek). "ἄγγουρα" in: Etymological Dictionary of Greek. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2014. Brill Online. August 12, 2014. < http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/lemma.html?id=3041 >
Robert Farren, PIE culture words collection, 2017
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