APA (7th ed.) Citation

Helbig, G., & Ricken, H. (1973). Die Negation / Gerhard Helbig, Helga Ricken. VEB Verlag Enzyklopadie.

Chicago Style (17th ed.) Citation

Helbig, Gerhard, and Helga Ricken. Die Negation / Gerhard Helbig, Helga Ricken. Leipzig: VEB Verlag Enzyklopadie, 1973.

MLA (9th ed.) Citation

Helbig, Gerhard, and Helga Ricken. Die Negation / Gerhard Helbig, Helga Ricken. VEB Verlag Enzyklopadie, 1973.

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