↑Beekes 2014, σελίδες 47–48: "Our knowledge of Indo-European has expanded so much, especially in the last thirty years (notably because of the laryngeal theory) that in some cases we can say almost with certainty that an Indo-European reconstruction is impossible. [...] In my EDG, I marked with >PG< all words which, in my view, were of Pre-Greek origin. I found 1106 words.".
↑Renfrew 1998, hlm. 244–245 (see Tables 1 and 2 for all loanwords except personal names, toponyms and theonyms).