Pawin Puapornpong และ Jaithip Sukpool. (2002) Antenatal and labor care problems in Ongkharak district,Nakorn-Nayok province. <i>Journal of Medicine and Health Sciences</i>, <i>9</i>(2), 62-67.Pawin Puapornpong และ Jaithip Sukpool. "Antenatal and labor care problems in Ongkharak district,Nakorn-Nayok province". Journal of Medicine and Health Sciences 9 (2002):62-67.Pawin Puapornpong และ Jaithip Sukpool. Antenatal and labor care problems in Ongkharak district,Nakorn-Nayok province. Faculty of Medicine,Srinakharinwirot University:ม.ป.ท. 2002.