APA (7th ed.) Citation

Layer, D. K., & Richardson, C. (1991). Lisp Systems in the 1990s. Communications of the ACM, 34(9), 48. https://doi.org/10.1145/114669.114674

Chicago Style (17th ed.) Citation

Layer, D. Kevin, and Chris Richardson. "Lisp Systems in the 1990s." Communications of the ACM 34, no. 9 (1991): 48. https://doi.org/10.1145/114669.114674.

MLA (9th ed.) Citation

Layer, D. Kevin, and Chris Richardson. "Lisp Systems in the 1990s." Communications of the ACM, vol. 34, no. 9, 1991, p. 48, https://doi.org/10.1145/114669.114674.