Template:R:ine:CIEL
Beekes, Robert S. P. (2011) Comparative Indo-European Linguistics: An Introduction [比較印歐語言學：導論], revised and corrected by Michiel de Vaan, 2nd版, Amsterdam, Philadelphia: John Benjamins Publishing Company
Beekes, Robert S. P. (2011) Comparative Indo-European Linguistics: An Introduction [比較印歐語言學：導論], revised and corrected by Michiel de Vaan, 2nd版, Amsterdam, Philadelphia: John Benjamins Publishing Company