Panchit Promachot. (1993) Study on bacterial contamination and associated factors of bottle milk in infants under six months. Mahidol University,:ม.ป.ท.Panchit Promachot. 1993. Study on bacterial contamination and associated factors of bottle milk in infants under six months. ม.ป.ท.:Mahidol University,;Panchit Promachot. Study on bacterial contamination and associated factors of bottle milk in infants under six months. ม.ป.ท.:Mahidol University, 1993. Print.