Here is the typical APA format for a reference section:
Jarvis, B. G. (200x). MediaLab (Version 200x.x.x) [Computer Software]. New York, NY: Empirisoft Corporation.
Jarvis, B. G. (200x). DirectRT (Version 200x.x.x) [Computer Software]. New York, NY: Empirisoft Corporation.
See Also:
American Psychological Association. (2001, August 1). APA style for electronic resources. Available from http://www.apastyle.org.