^Ringe, Donald (2006),From Proto-Indo-European to Proto-Germanic (A Linguistic History of English; 1)[1], Oxford: Oxford University Press,→ISBN,page45
^Matzinger, Joachim (2017–2018), “Chapter XV: Albanian”, in Klein, Jared S.,Joseph, Brian D.,Fritz, Matthias, editors,Handbook of Comparative and Historical Indo-European Linguistics: An International Handbook (Handbücher zur Sprach- und Kommunikationswissenschaft[Handbooks of Linguistics and Communication Science];41.2), Berlin; Boston: De Gruyter Mouton,→ISBN, § The lexicon of Albanian, page1791
^Buck, Carl (1904),A grammar of Oscan and Umbrian, Ginn & Co, page19