Cita APA (7th ed.)
ebrary, Inc, Herbst, T., & Popp, K. (1999). The Perfect learners' dictionary (?). Max Niemeyer Verlag.
Cita Chicago (17th ed.)
ebrary, Inc, Thomas Herbst, i Kerstin Popp. The Perfect Learners' Dictionary (?). Tübingen: Max Niemeyer Verlag, 1999.
Cita MLA (9th ed.)
ebrary, Inc, et al. The Perfect Learners' Dictionary (?). Max Niemeyer Verlag, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.