Nualjun Sangmanee. (2004) Analysis of Mental Health Hot line 1667 Service System : Case Study of telephone calls to the center of Department of Mental Health. <i>Journal of Mental Health of Thailand</i>, <i>12</i>(3), 150-157.Nualjun Sangmanee. "Analysis of Mental Health Hot line 1667 Service System : Case Study of telephone calls to the center of Department of Mental Health". Journal of Mental Health of Thailand 12 (2004):150-157.Nualjun Sangmanee. Analysis of Mental Health Hot line 1667 Service System : Case Study of telephone calls to the center of Department of Mental Health. Department of Mental Health Thailand:ม.ป.ท. 2004.