Madhuwanthi และผู้แต่งคนอื่นๆ. (2016) Employment practices and employers'attitudes towards elderly teachers in private sector schools in Sri Lanka. National Institute of Development Administration:ม.ป.ท.Madhuwanthi และผู้แต่งคนอื่นๆ. 2016. Employment practices and employers'attitudes towards elderly teachers in private sector schools in Sri Lanka. ม.ป.ท.:National Institute of Development Administration;Madhuwanthi และผู้แต่งคนอื่นๆ. Employment practices and employers'attitudes towards elderly teachers in private sector schools in Sri Lanka. ม.ป.ท.:National Institute of Development Administration, 2016. Print.