Sukritdha Noynawas และ Ardiporn khemarangsan. (2010) The development of self-study materials in training program for internship students who work as a server, for better quality of service in main dining room at Canyon Ranch Resort Tucson, Arizona USA. Silpakorn University:ม.ป.ท.Sukritdha Noynawas และ Ardiporn khemarangsan. 2010. The development of self-study materials in training program for internship students who work as a server, for better quality of service in main dining room at Canyon Ranch Resort Tucson, Arizona USA. ม.ป.ท.:Silpakorn University;Sukritdha Noynawas และ Ardiporn khemarangsan. The development of self-study materials in training program for internship students who work as a server, for better quality of service in main dining room at Canyon Ranch Resort Tucson, Arizona USA. ม.ป.ท.:Silpakorn University, 2010. Print.