Sudarat Sittisombut และผู้แต่งคนอื่นๆ. (2002) The effectiveness of advance directive for terminal care in terminally ill patients in Chiang Mai University Hospital. Chulalongkorn University:ม.ป.ท.Sudarat Sittisombut และผู้แต่งคนอื่นๆ. 2002. The effectiveness of advance directive for terminal care in terminally ill patients in Chiang Mai University Hospital. ม.ป.ท.:Chulalongkorn University;Sudarat Sittisombut และผู้แต่งคนอื่นๆ. The effectiveness of advance directive for terminal care in terminally ill patients in Chiang Mai University Hospital. ม.ป.ท.:Chulalongkorn University, 2002. Print.