↑5.05.1Adams, Douglas Q. (2013), “pärk-”, inA Dictionary of Tocharian B: Revised and Greatly Enlarged (Leiden Studies in Indo-European;10), Amsterdam, New York: Rodopi,→ISBN,page399
↑6.06.16.2Kloekhorst, Alwin (2008), “parkii̯e/a-ᶻⁱ”, inEtymological Dictionary of the Hittite Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 5), Leiden, Boston: Brill,→ISBN,pages736-737
↑7.07.1Cheung, Johnny (2007), “*barz”, inEtymological Dictionary of the Iranian Verb (Leiden Indo-European Etymological Dictionary Series; 2), Leiden, Boston: Brill,→ISBN, pages12-13
^De Vaan, Michiel (2008), “fortis”, inEtymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill,→ISBN,page236
↑11.011.1Adams, Douglas Q. (2013), “pärkäre*”, inA Dictionary of Tocharian B: Revised and Greatly Enlarged (Leiden Studies in Indo-European;10), Amsterdam, New York: Rodopi,→ISBN,page399