Pakaphan Kiatchoosakun และผู้แต่งคนอื่นๆ. (2006) A study of vitamin A and antioxidants levels in premature infants and the effect of vitamin A supplementation to prevent bronchopulmonary dysplasia. Faculty of Medicine, Khon Kaen University,:ม.ป.ท.Pakaphan Kiatchoosakun และผู้แต่งคนอื่นๆ. 2006. A study of vitamin A and antioxidants levels in premature infants and the effect of vitamin A supplementation to prevent bronchopulmonary dysplasia. ม.ป.ท.:Faculty of Medicine, Khon Kaen University,;Pakaphan Kiatchoosakun และผู้แต่งคนอื่นๆ. A study of vitamin A and antioxidants levels in premature infants and the effect of vitamin A supplementation to prevent bronchopulmonary dysplasia. ม.ป.ท.:Faculty of Medicine, Khon Kaen University, 2006. Print.