Somchai Lakananuruk และผู้แต่งคนอื่นๆ. (1999) Determinants of preventive health behavior and morbidity among the elderly in Bangkok Metropolis. National Institute of Development Administration:ม.ป.ท.Somchai Lakananuruk และผู้แต่งคนอื่นๆ. 1999. Determinants of preventive health behavior and morbidity among the elderly in Bangkok Metropolis. ม.ป.ท.:National Institute of Development Administration;Somchai Lakananuruk และผู้แต่งคนอื่นๆ. Determinants of preventive health behavior and morbidity among the elderly in Bangkok Metropolis. ม.ป.ท.:National Institute of Development Administration, 1999. Print.