Napaporn Jiraphongsa. (1992) Maternal perception and socioeconomic factors associated with severity of acute respiratory infection in children aged under five years. Mahidol University,:ม.ป.ท.Napaporn Jiraphongsa. 1992. Maternal perception and socioeconomic factors associated with severity of acute respiratory infection in children aged under five years. ม.ป.ท.:Mahidol University,;Napaporn Jiraphongsa. Maternal perception and socioeconomic factors associated with severity of acute respiratory infection in children aged under five years. ม.ป.ท.:Mahidol University, 1992. Print.