Malik และ Mazhar Ul Haque. (1997) Factors affecting severity of acute respiratory infections among children under five years in Children Hospital Islamabad, Pakistan. Mahidol University,:ม.ป.ท.Malik และ Mazhar Ul Haque. 1997. Factors affecting severity of acute respiratory infections among children under five years in Children Hospital Islamabad, Pakistan. ม.ป.ท.:Mahidol University,;Malik และ Mazhar Ul Haque. Factors affecting severity of acute respiratory infections among children under five years in Children Hospital Islamabad, Pakistan. ม.ป.ท.:Mahidol University, 1997. Print.