et. al., Neng Sri Triana,. “Analysis of Quality Control to Reduce Defective Products for Dry Syrup Using Six-Sigma Method in PT XYZ”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 7 (April 16, 2021): 2776–2787. Accessed September 11, 2025. https://textitlejournal.com/turcomat.org/index.php/turkbilmat/article/view/3814.