1. Cherry, K. (2020). 20 Common Defense Mechanisms Used for Anxiety. Verywell Mind. Retrieved from https://www.verywellmind.com/defense-mechanisms-2795960
2. Feist, J., & Feist, G. J. (2008). Theories of Personality By Feist & Feist (6th, Sixth Edition).
3. Feist, J., Gregory J Feist, D., & Roberts, T. (2017). Theories of personality. McGraw-Hill Education.
4. Glas, G. (2020). An Enactive Approach to Anxiety and Anxiety Disorders. Philosophy, Psychiatry, & Psychology 27(1), 35-50. doi:10.1353/ppp.2020.0005
5. Grove, S. (2021). Retrieving Darwin's Revolutionary Idea: The Reluctant Radical. Rowman & Littlefield.