Acrophobia (Fear of Heights)（Cleveland Clinic）https://my.clevelandclinic.org/health/diseases/21956-acrophobia-fear-of-heights#:~:text=What%20is%20acrophobia%3F,positioned%20at%20a%20significant%20height Accessed June 8, 2022

Acrophobia, or why are some people are afraid of heights（Psychlopaedia）https://psychlopaedia.org/health/republished/health-check-why-are-some-people-afraid-of-heights/ Accessed June 8, 2022

Heightened Anxiety：How to overcome a fear of high places（Anxiety UK）https://www.anxietyuk.org.uk/blog/heightened-anxiety-overcome-fear-high-places/ Accessed June 8, 2022

Fears Episode 11: Acrophobia（Penn State）https://sites.psu.edu/akb13/2015/02/12/fears-episode-11-acrophobia/ Accessed June 8, 2022

Virtual Reality Exposure Therapy for Fear of Heights: Clinicians’ Attitudes Become More Positive After Trying VRET（frontiers in Psychology）https://www.frontiersin.org/articles/10.3389/fpsyg.2021.671871/full Accessed June 8, 2022