Sultana และ Shahin. (1997) Analysis of first birth interval of adolescent mothers in Bangladesh, 1993-1994. Mahidol University,:ม.ป.ท.Sultana และ Shahin. 1997. Analysis of first birth interval of adolescent mothers in Bangladesh, 1993-1994. ม.ป.ท.:Mahidol University,;Sultana และ Shahin. Analysis of first birth interval of adolescent mothers in Bangladesh, 1993-1994. ม.ป.ท.:Mahidol University, 1997. Print.