APA (7th ed.) Citation

Kupka, I., & Wilsing, N. (1980). Conversational languages. Wiley.

Chicago Style (17th ed.) Citation

Kupka, Ingbert, and Norbert Wilsing. Conversational Languages. Chichester u.a: Wiley, 1980.

MLA (9th ed.) Citation

Kupka, Ingbert, and Norbert Wilsing. Conversational Languages. Wiley, 1980.

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