Jihadi, Ghany Radifan, and Caroline Veda Pangemanan. “Implementing Process Capability Index (Cpk) for Effective Improvement Stability the Case of a Pressing Shop of an Automobile Company”. RA Journal of Applied Research 12, no. 02 (February 12, 2026): 120–125. Accessed October 25, 2026. https://www.rajournals.in/index.php/rajar/article/view/1914.