Piyathida Sriruksa และผู้แต่งคนอื่นๆ. (2001) Assessing quality of life of the elderly people in Khon Kaen Province. Chulalongkorn University:ม.ป.ท.Piyathida Sriruksa และผู้แต่งคนอื่นๆ. 2001. Assessing quality of life of the elderly people in Khon Kaen Province. ม.ป.ท.:Chulalongkorn University;Piyathida Sriruksa และผู้แต่งคนอื่นๆ. Assessing quality of life of the elderly people in Khon Kaen Province. ม.ป.ท.:Chulalongkorn University, 2001. Print.