Hei, Yirui, Jasni Dolah, and Shenghai Hei. “A Study of Service Touchpoints in the Design of Assistive Products Required by People With Visual Impairment”. Journal of Human Centered Technology 2, no. 1 (February 6, 2023): 51–60. Accessed March 28, 2024. https://humentech.utm.my/index.php/humentech/article/view/46.