Karthik Santhanaraj, Dr. Barkathunissa A. “A Study on the Factors Affecting Usage of Voice Assistants and the Interface Transition from Touch to Voice”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, Apr. 2020, pp. 3084 -02, http://sersc.org/journals/index.php/IJAST/article/view/11612.