Suthida Changprachak และ Phichai Ratnatilaka na Bhuket. (2021) Elderly policy development : an analysis of the punctuated equilibrium theory. National Institute of Development Administration:ม.ป.ท.Suthida Changprachak และ Phichai Ratnatilaka na Bhuket. 2021. Elderly policy development : an analysis of the punctuated equilibrium theory. ม.ป.ท.:National Institute of Development Administration;Suthida Changprachak และ Phichai Ratnatilaka na Bhuket. Elderly policy development : an analysis of the punctuated equilibrium theory. ม.ป.ท.:National Institute of Development Administration, 2021. Print.