APA (7th ed.) Citation

Ashcroft, E., & Wadge, W. (1977). Lucid, a Nonprocedural Language with Iteration. Communications of the ACM, 20(7), 519. https://doi.org/10.1145/359636.359715

Chicago Style (17th ed.) Citation

Ashcroft, E.A, and W.W Wadge. "Lucid, a Nonprocedural Language with Iteration." Communications of the ACM 20, no. 7 (1977): 519. https://doi.org/10.1145/359636.359715.

MLA (9th ed.) Citation

Ashcroft, E.A, and W.W Wadge. "Lucid, a Nonprocedural Language with Iteration." Communications of the ACM, vol. 20, no. 7, 1977, p. 519, https://doi.org/10.1145/359636.359715.