Beard, R. (1981). The Indo-European lexicon: A full synchronic theory. North Holland.
Chicago Style aipamenaBeard, Robert. The Indo-European Lexicon: A Full Synchronic Theory. Amsterdam: North Holland, 1981.
MLA aipamenaBeard, Robert. The Indo-European Lexicon: A Full Synchronic Theory. North Holland, 1981.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.