Kathaporn Kampis และ Nuntavarn Vichit-Vadakan. (1998) Improvement of service quality through action research of an off-hour clinic at Chulalongkorn Hospital. Chulalongkorn University:ม.ป.ท.Kathaporn Kampis และ Nuntavarn Vichit-Vadakan. 1998. Improvement of service quality through action research of an off-hour clinic at Chulalongkorn Hospital. ม.ป.ท.:Chulalongkorn University;Kathaporn Kampis และ Nuntavarn Vichit-Vadakan. Improvement of service quality through action research of an off-hour clinic at Chulalongkorn Hospital. ม.ป.ท.:Chulalongkorn University, 1998. Print.