Lehmann, W. P. (1993). Theoretical bases of Indo-European linguistics. Routledge.
Chicago Style (17th ed.) ZitazioaLehmann, Winfred P. Theoretical Bases of Indo-European Linguistics. London: Routledge, 1993.
MLA (9th ed.) ZitazioaLehmann, Winfred P. Theoretical Bases of Indo-European Linguistics. Routledge, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.