2.      Mayo Clinic. (2016, April 20). Slide show: How your brain works. Retrieved from https://www.mayoclinic.org/brain/sls-20077047?s=3 

3.      Takiguchi, S. (2017, August 14). Human Brain Thinking Process. Retrieved from https://www.livestrong.com/article/202078-human-brain-thinking-process/ 

4.      Dougherty, E. (2011, April 26). What are thoughts made of? Retrieved from https://engineering.mit.edu/engage/ask-an-engineer/what-are-thoughts-made-of/ 

5.      Introduction to Psychology. (n.d.). Parts of the Brain Involved with Memory. Retrieved from https://courses.lumenlearning.com/wsu-sandbox/chapter/parts-of-the-brain-involved-with-memory/#Figure_08_02_Brain 

6.      Introduction to Psychology. (n.d.). How Memory Functions. Retrieved from https://courses.lumenlearning.com/wsu-sandbox/chapter/how-memory-functions/ 

7.      Atkinson, R. C., & Shiffrin, R. M. (1968). Human memory: A proposed system and its control processes. In K. W. Spence & J. T. Spence (Eds.), The psychology of learning and motivation: Volume 2 (pp. 89–195). New York, NY: Academic Press. 

8.      Scriven M, Paul R. Defining critical thinking. The Critical Thinking Community Web site. http://www.criticalthinking.org/pages/defining-critical-thinking/410 Accessed April 22, 2015.

9.      Willingham D. Critical thinking: why is it so hard to teach? Am Educ. 2007; summer:8-19. http://www.aft.org/sites/default/files/periodicals/Crit_Thinking.pdf   Accessed April 30, 2015.

10.  Panettieri, R. C. (2015). Can Critical-Thinking Skills Be Taught? Journal of the American Society of Radiologic Technologists, Volume 86, Number 6, 686-688. Retrieved from https://media.asrt.org/pdf/publications/RADT15_Vol86_No6.pdf#page=96