Software
Rightsholder, A. A. (year). Title of program (Version number) [Description of form]. Retrieved from http://xxxxx
More Examples
Rightsholder, A. A. (year). Title of program (Version number) [Description of form]. Retrieved from http://xxxxx
QSR International. (2012). NVivo 10 [Computer software]. Available from http://www.qsrinternational.com