MUST and MUST NOT.

MLA

Neville-Neil, George V. “MUST and MUST NOT.” Communications of the ACM, vol. 62, no. 8, Aug. 2019, pp. 30–31. EBSCOhost, https://doi.org/10.1145/3341227.

APA

Neville-Neil, G. V. (2019). MUST and MUST NOT. Communications of the ACM, 62(8), 30–31. https://doi.org/10.1145/3341227

Chicago

Neville-Neil, George V. 2019. “MUST and MUST NOT.” Communications of the ACM 62 (8): 30–31. doi:10.1145/3341227.