Winsteps®(Version 3.75. 0)[Computer Software]. Beaverton, Oregon: Winsteps. com. Retrieved January 1, 2012
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JM Linacre & John M. Linacre (2012). Winsteps®(Version 3.75. 0)[Computer Software]. Beaverton, Oregon: Winsteps. com. Retrieved January 1, 2012. https://scholar.google.com/citations?view_op=view_citation&hl=en&user=EhL0Z4IAAAAJ&cstart=100&pagesize=100&citation_for_view=EhL0Z4IAAAAJ:ubry08Y2EpUC