An Interactive Command Generating Facility.

MLA

Grant, Charles A., and B. Randell. “An Interactive Command Generating Facility.” Communications of the ACM, vol. 13, no. 7, July 1970, pp. 403–06. EBSCOhost, https://doi.org/10.1145/362686.362689.

APA

Grant, C. A., & Randell, B. (1970). An Interactive Command Generating Facility. Communications of the ACM, 13(7), 403–406. https://doi.org/10.1145/362686.362689

Chicago

Grant, Charles A., and B. Randell. 1970. “An Interactive Command Generating Facility.” Communications of the ACM 13 (7): 403–6. doi:10.1145/362686.362689.