Zahidah, Nurul. “Optimizing Certification Submission through an Integrated Information System With DMAIC Framework”. JEMSI (Jurnal Ekonomi, Manajemen, Dan Akuntansi), vol. 11, no. 4, Aug. 2025, pp. 2408-29, https://doi.org/10.35870/jemsi.v11i4.4381.