APA (7th ed.) Citation

Vargas-Vera, M., Robertson, D., & Inder, R. (1992). An environment for combining Prolog programs.

Chicago Style (17th ed.) Citation

Vargas-Vera, María, Dave Robertson, and Robert Inder. An Environment for Combining Prolog Programs. Edinburgh, 1992.

MLA (9th ed.) Citation

Vargas-Vera, María, et al. An Environment for Combining Prolog Programs. 1992.