Ashraf, Anam, Xiaoxian Zhu, Jianhua Liu, and Qasim Rauf. 2020. “A Systematic Review of Usability Engineering Management Studies for the Aging Population-UEM4Aging”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 50 (2): 190-214. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/11008.