วรรณศิริ อุไรวรรณ. “Increasing The Packaging Efficiency for Transport by Lean Concepts : A Case Study of Yogurt Manufacturing Company”. NKRAFA JOURNAL OF SCIENCE AND TECHNOLOGY 12 (August 2, 2018): 90–99. Accessed May 13, 2024. https://ph02.tci-thaijo.org/index.php/nkrafa-sct/article/view/155076.