Wattanapon Chumphet. (2018) Development of Voice Information System for the Elderly. <i>Journal of Information Science</i>, <i>36</i>(2), 36 - 57.Wattanapon Chumphet. "Development of Voice Information System for the Elderly". Journal of Information Science 36 (2018):36 - 57.Wattanapon Chumphet. Development of Voice Information System for the Elderly. Klungnana Vitthaya Press:ม.ป.ท. 2018.