Napitupulu และ Manaor Fl. (1993) Factors influencing the breast feeding on infants six months of age or less at the General Hospital of Jambi province. Mahidol University,:ม.ป.ท.Napitupulu และ Manaor Fl. 1993. Factors influencing the breast feeding on infants six months of age or less at the General Hospital of Jambi province. ม.ป.ท.:Mahidol University,;Napitupulu และ Manaor Fl. Factors influencing the breast feeding on infants six months of age or less at the General Hospital of Jambi province. ม.ป.ท.:Mahidol University, 1993. Print.