ตั้งใจกตัญญู ธ., โรจน์นิรุตติกุล ณ. and แสงมณี ว. 2015. Factors Affecting Operational Efficiency of IL6S System in Confectionary Manufacturing Process : Case Study of Mondelez International (Thailand) Co.,Ltd. Journal of Industrial Education. 14, 1 (Apr. 2015), 234–241.