APA (7th ed.) Citation

Gull, W. E., & Jenkins, M. A. (1979). Recursive data structures in APL. Communications of the ACM, 22, 79. https://doi.org/10.1145/359060.359067

Chicago Style (17th ed.) Citation

Gull, W. E., and M. A. Jenkins. "Recursive Data Structures in APL." Communications of the ACM 22 (1979): 79. https://doi.org/10.1145/359060.359067.

MLA (9th ed.) Citation

Gull, W. E., and M. A. Jenkins. "Recursive Data Structures in APL." Communications of the ACM, vol. 22, 1979, p. 79, https://doi.org/10.1145/359060.359067.