Nopavut Punyasiri และ Napassavong Rojanarowan. (2010) Economic statistical design for x-bar control chart. Chulalongkorn University:ม.ป.ท.Nopavut Punyasiri และ Napassavong Rojanarowan. 2010. Economic statistical design for x-bar control chart. ม.ป.ท.:Chulalongkorn University;Nopavut Punyasiri และ Napassavong Rojanarowan. Economic statistical design for x-bar control chart. ม.ป.ท.:Chulalongkorn University, 2010. Print.