ebrary, Inc, & Thieroff, R. (1995). Tense systems in European languages. Max Niemeyer Verlag.
Lua i Stíl Chicago (17ú heag.)ebrary, Inc, agus Rolf Thieroff. Tense Systems in European Languages. Tübingen: Max Niemeyer Verlag, 1995.
Lua MLA (9ú heag.)ebrary, Inc, agus Rolf Thieroff. Tense Systems in European Languages. Max Niemeyer Verlag, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.