Please note that you don't need to give references to standard software and programming languages, such as Windows Excel and Word, Java, Adobe Photoshop or SPSS.
Miller, M. E. (1993). The interactive tester (Version 4.0) [Computer software]. Psytek Services.
St. James, J., Schneider, W. & Eschman, A. (2003). PsychMate Student Guide (Version 2.0) [Computer software]. http://www.pstnet.com/products/PsychMate/default.htm
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