APA (7th ed.) Citation

(1999). The perfect learners' dictionary (?). Niemeyer.

Chicago Style (17th ed.) Citation

The Perfect Learners' Dictionary (?). Tübingen: Niemeyer, 1999.

MLA (9th ed.) Citation

The Perfect Learners' Dictionary (?). Niemeyer, 1999.

Warning: These citations may not always be 100% accurate.