Pirasak Sriruecha. 2001. Happy life of the elderly in a village of Khon Kaen province : a case study of Ban Kai Na of Muang district. Field of Study Medical and Health Social Science, Mahidol University;
Pirasak Sriruecha. (2001) Happy life of the elderly in a village of Khon Kaen province : a case study of Ban Kai Na of Muang district . Mahidol University/Bangkok.
Pirasak Sriruecha. Happy life of the elderly in a village of Khon Kaen province : a case study of Ban Kai Na of Muang district. . Bangkok:Mahidol University, 2001.
Pirasak Sriruecha. (2001) Happy life of the elderly in a village of Khon Kaen province : a case study of Ban Kai Na of Muang district . Mahidol University/Bangkok.