Wachiraporn Wilaiwan และ Wattasit Siriwong. (2017) Effectiveness of healthy e-elderly people intervention (HEPI) application for reduction health effects from mobile communication device and application usages among elderly people in Thailand. Chulalongkorn University:ม.ป.ท.Wachiraporn Wilaiwan และ Wattasit Siriwong. 2017. Effectiveness of healthy e-elderly people intervention (HEPI) application for reduction health effects from mobile communication device and application usages among elderly people in Thailand. ม.ป.ท.:Chulalongkorn University;Wachiraporn Wilaiwan และ Wattasit Siriwong. Effectiveness of healthy e-elderly people intervention (HEPI) application for reduction health effects from mobile communication device and application usages among elderly people in Thailand. ม.ป.ท.:Chulalongkorn University, 2017. Print.