Ralston, Patricia A, and Cathy L Bays. “Critical Thinking Development In Undergraduate Engineering Students From Freshman Through Senior Year: A 3-Cohort Longitudinal Study”. American Journal of Engineering Education (AJEE) 6, no. 2 (November 30, 2015): 85-98. Accessed November 30, 2020. https://clutejournals.com/index.php/AJEE/article/view/9504.