APA (7th ed.) Citation
(2012). ACM Member News. Communications of the ACM, 55(11), 21.
Chicago Style (17th ed.) Citation
"ACM Member News." Communications of the ACM 55, no. 11 (2012): 21.
MLA (9th ed.) Citation
"ACM Member News." Communications of the ACM, vol. 55, no. 11, 2012, p. 21.
Warning: These citations may not always be 100% accurate.