Kiratikan Sadakorn และ Pongthep Chandasuwan. (2019) A study on relationship between human capital and aging preparedness of million birth cohort teachers in primary school affiliated with Sukhothai primary educational service area office 1. National Institute of Development Administration:ม.ป.ท.Kiratikan Sadakorn และ Pongthep Chandasuwan. 2019. A study on relationship between human capital and aging preparedness of million birth cohort teachers in primary school affiliated with Sukhothai primary educational service area office 1. ม.ป.ท.:National Institute of Development Administration;Kiratikan Sadakorn และ Pongthep Chandasuwan. A study on relationship between human capital and aging preparedness of million birth cohort teachers in primary school affiliated with Sukhothai primary educational service area office 1. ม.ป.ท.:National Institute of Development Administration, 2019. Print.