Saratsanun Unnopporn และ Achakorn Wongpreedee. (2023) Success of the implementation of elderly welfare system policy under sustainability principles in the northeast of Thailand. National Institute of Development Administration:ม.ป.ท.Saratsanun Unnopporn และ Achakorn Wongpreedee. 2023. Success of the implementation of elderly welfare system policy under sustainability principles in the northeast of Thailand. ม.ป.ท.:National Institute of Development Administration;Saratsanun Unnopporn และ Achakorn Wongpreedee. Success of the implementation of elderly welfare system policy under sustainability principles in the northeast of Thailand. ม.ป.ท.:National Institute of Development Administration, 2023. Print.