APA (7th ed.) Citation
(2009). Calendar of Events. Communications of the ACM, 52(6), 27.
Chicago Style (17th ed.) Citation
"Calendar of Events." Communications of the ACM 52, no. 6 (2009): 27.
MLA (9th ed.) Citation
"Calendar of Events." Communications of the ACM, vol. 52, no. 6, 2009, p. 27.
Warning: These citations may not always be 100% accurate.