APA (7th ed.) Citation

Kupka, I., & Wilsing, N. (1972). A formal framework for dialog languages.

Chicago Style (17th ed.) Citation

Kupka, Ingbert, and Norbert Wilsing. A Formal Framework for Dialog Languages. Hamburg, 1972.

MLA (9th ed.) Citation

Kupka, Ingbert, and Norbert Wilsing. A Formal Framework for Dialog Languages. 1972.

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