Find peer-reviewed, published research using the Inquisit Reading Span Task (RSPAN)
Daneman, M., & Carpenter, P.A. (1980). Individual differences in WM and reading. Journal of Verbal Learning and Verbal Behavior, 19, 450–466.
Conway, A. R. A., Kane, M. J., Bunting, M. F., Hambrick, D. Z., Wilhelm, O., & Engle, R. W. (2005). Working memory span tasks: A methodological review and user's guide. Psychonomic Bulletin and Review, 12, 769 - 786.