Mya และ Yin Yin. (1992) The effect of scoio-economic status on infant mortality in Thailand. Mahidol University,:ม.ป.ท.Mya และ Yin Yin. 1992. The effect of scoio-economic status on infant mortality in Thailand. ม.ป.ท.:Mahidol University,;Mya และ Yin Yin. The effect of scoio-economic status on infant mortality in Thailand. ม.ป.ท.:Mahidol University, 1992. Print.