Columbia Guide to Online Style
I have mentioned the problems of citing computer games. The Columbia guide to Online Style has already tackled this problem:

2.16 Software Programs and Video Games

Humanities Style
Cite the name of the author or corporate author (if available); the title of the software program, in italics; the version number (if applicable and if not included in the software title); and the publication information, including the date of publication (if known).

ID Software. The Ultimate Doom.
New York: GT Interactive Software, 1995.

Scientific Style
Cite the last name and initials of the author (if available); the date of publication or release, in parentheses; the title of the software program or video game, in italics; the version number (if applicable and if not included in the software title), in parentheses; and the publication information.

ID Software. (1993). The ultimate doom.
NY: GT Interactive Software.