Fifty Years of Operating Systems.

MLA

Denning, Peter J. “Fifty Years of Operating Systems.” Communications of the ACM, vol. 59, no. 3, Mar. 2016, pp. 30–32. EBSCOhost, https://doi.org/10.1145/2880150.

APA

Denning, P. J. (2016). Fifty Years of Operating Systems. Communications of the ACM, 59(3), 30–32. https://doi.org/10.1145/2880150

Chicago

Denning, Peter J. 2016. “Fifty Years of Operating Systems.” Communications of the ACM 59 (3): 30–32. doi:10.1145/2880150.