Lua error in Module:parameters at line 290: Parameter 1 should be a valid language, etymology language or family code; the value "psu" is not valid. See WT:LOL, WT:LOL/E and WT:LOF.
^ Sihler, Andrew L. (1995) New Comparative Grammar of Greek and Latin, Oxford, New York: Oxford University Press, →ISBN, page 418
^ Beekes, Robert S. P. (2011) Comparative Indo-European Linguistics: An Introduction, 2nd edition, revised and corrected by Michiel de Vaan, Amsterdam, Philadelphia: John Benjamins Publishing Company, page 238
