Williams, J., R. Rice, B. Lauren, S. Morrison, K. V. Winkle, and T. Elliott. “Problem-Based Universal Design for Learning in Technical Communication and Rhetoric Instruction”. Journal of Problem Based Learning in Higher Education, vol. 1, no. 1, Aug. 2013, pp. 247-61, doi:10.5278/ojs.jpblhe.v1i1.285.