National Journal 2020 2020 Sakol Teeravarunyou, 2020, “A study on graphic user interface (GUI) of cross-platform operating system for mobile phone” Thai Journal of Ergonomics: Volume 3 Issue 1 January – June 2020: p. 1-9 Krittiya Tangmanee, Sakol Teeravarunyou and Nattanit Buaban,2020, “Voice User Interface (VUI): A Review of Present and Potential Voice Assistant (VA) applications” ,Thai Journal of Ergonomics: Volume 3 Issue 2 July – December 2020: p. 32-44