Kittipong Kongsomboon และผู้แต่งคนอื่นๆ. (2007) Health problems among students in Ongkharak district, Nakhon Nayok provinceaccording to gender and class: Cross sectional study. <i>Journal of Medicine and Health Sciences</i>, <i>14</i>(1), 10-24.Kittipong Kongsomboon และผู้แต่งคนอื่นๆ. "Health problems among students in Ongkharak district, Nakhon Nayok provinceaccording to gender and class: Cross sectional study". Journal of Medicine and Health Sciences 14 (2007):10-24.Kittipong Kongsomboon และผู้แต่งคนอื่นๆ. Health problems among students in Ongkharak district, Nakhon Nayok provinceaccording to gender and class: Cross sectional study. Faculty of Medicine,Srinakharinwirot University:ม.ป.ท. 2007.