↑ 2.02.1De Vaan, Michiel (2008) “serpō, -ere”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 558
Please see Module:checkparams for help with this warning.Orel, Vladimir E. (2000) A concise historical grammar of the Albanian language: reconstruction of Proto-Albanian[1], Leiden, Boston, Köln: Brill, →ISBN, page gjarpër ~ gjarpën