Syarifudin, A., S. N. Arthawati, and S. M. Wirawati. “Quality Control of PCC (Portland Composite Cement) Using the Six Sigma Method at PT. XY”. Journal of Industrial Engineering & Management Research, Vol. 7, no. 3, May 2026, pp. 28-37, doi:10.7777/jiemar.v7i3.709.