Nuttapong Wonganawat และ Angsumalin Senjuntichai. (2015) Defect reduction in ready rice packaging by applying Six Sigma approach. Chulalongkorn University:ม.ป.ท.Nuttapong Wonganawat และ Angsumalin Senjuntichai. 2015. Defect reduction in ready rice packaging by applying Six Sigma approach. ม.ป.ท.:Chulalongkorn University;Nuttapong Wonganawat และ Angsumalin Senjuntichai. Defect reduction in ready rice packaging by applying Six Sigma approach. ม.ป.ท.:Chulalongkorn University, 2015. Print.