Reber, B. H., S. E. Kaufman, and F. Cropp. “Assessing Q-Assessor: A Validation Study of Computer-Based Q Sorts Versus Paper Sorts”. Operant Subjectivity, vol. 23, no. 4, July 2000, https://ojs.library.okstate.edu/osu/index.php/osub/article/view/8945.