From the "Information for Authors" of the Communications of the ACM

All articles will also be copyedited to conform to The Chicago Manual of Style (655.25 C532ma ed.14,1993 Reference) as well as to the Communications' own style and format.

Communications Reference Style

Journal:

Parker, R. Lotus copyright protection is turning into a feeding frenzy. Infoworld 12,28 (Jul. 1990), 42-49.

Book:

Hoffman, W.M. and Moore, J.M., Eds. Ethics and the Management of Computer Technology. Oelgeschlager, Gunn and Hain, Cambridge, Mass., 1982.

Proceedings:

Rumbaugh, J.E. Controlling propagation of operations using attributes on Relations. In Proceedings of OOPSLA '86 (Sept. 29-Oct. 2, Portland,Oreg.). ACM/SIGPLAN, New York, 1986, pp. 406-416.

comments to Sharon Siegler