APA (7th ed.) Citation
Hayes, B. (2008). Cloud Computing. Communications of the ACM, 51(7), 9-12.
Chicago Style (17th ed.) Citation
Hayes, Brian. "Cloud Computing." Communications of the ACM 51, no. 7 (2008): 9-12.
MLA (9th ed.) Citation
Hayes, Brian. "Cloud Computing." Communications of the ACM, vol. 51, no. 7, 2008, pp. 9-12.
Warning: These citations may not always be 100% accurate.