↑ 3.03.1Beekes, Robert S. P. (2010) “σέβομαι”, in Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series; 10), volume II, with the assistance of Lucien van Beek, Leiden, Boston: Brill, →ISBN, pages 1315-1316
^ Cheung, Johnny (2007) “*θi̯aǰ (*ti(n)ǰ²)”, in Etymological Dictionary of the Iranian Verb (Leiden Indo-European Etymological Dictionary Series; 2), Leiden, Boston: Brill, →ISBN, pages 392-393