APA (7th ed.) Citation

Hayes-Roth, F., & Jacobstein, N. (1994). The state of knowledge-based systems. Communications of the ACM, 37, 26. https://doi.org/10.1145/175247.175249

Chicago Style (17th ed.) Citation

Hayes-Roth, Frederick, and Neil Jacobstein. "The State of Knowledge-based Systems." Communications of the ACM 37 (1994): 26. https://doi.org/10.1145/175247.175249.

MLA (9th ed.) Citation

Hayes-Roth, Frederick, and Neil Jacobstein. "The State of Knowledge-based Systems." Communications of the ACM, vol. 37, 1994, p. 26, https://doi.org/10.1145/175247.175249.