APA (7th ed.) Citation

Apt, K. R., & Pellegrini, A. (1992). On the occur-check free prolog programs.

Chicago Style (17th ed.) Citation

Apt, Krzysztof R., and Alessandro Pellegrini. On the Occur-check Free Prolog Programs. Amsterdam, 1992.

MLA (9th ed.) Citation

Apt, Krzysztof R., and Alessandro Pellegrini. On the Occur-check Free Prolog Programs. 1992.

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