Prayoga, Bagus, and Deny Andesta. “Analysis of Mattress Product Quality Using Seven Tools Method; a Case Study: UD. Pandawa Lima”. MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering 4, no. 2 (June 17, 2022): 115-128. Accessed September 14, 2026. https://www.motivection.imeirs.org/index.php/motivection/article/view/117.