Tarigan, U. P. P., and D. Rajagukguk. “Analysis of Renewall Readiness for Quality Management System Certification Based on ISO 9001:2015 Using Gap Analysis ”. JKIE (Journal Knowledge Industrial Engineering), Vol. 10, no. 1, Apr. 2023, pp. 28-37, doi:10.35891/jkie.v10i1.4056.