C. และ Tshering Dorji. (2009) The Effects of Demographic, Investment, Rule and Contribution Factors on Pension Schemes in Bhutan. University of the Thai Chamber of Commerce:ม.ป.ท.C. และ Tshering Dorji. 2009. The Effects of Demographic, Investment, Rule and Contribution Factors on Pension Schemes in Bhutan. ม.ป.ท.:University of the Thai Chamber of Commerce;C. และ Tshering Dorji. The Effects of Demographic, Investment, Rule and Contribution Factors on Pension Schemes in Bhutan. ม.ป.ท.:University of the Thai Chamber of Commerce, 2009. Print.