Z. Mohamad, A. Ismail, M. H. M. Hani, N. Abd Samad, and M. H. M. Tahrir, “INTEGRATING ISO 9712-BASED CERTIFICATION INTO PUBLIC SKILLS TRAINING INSTITUTIONS: A SYSTEMATIC LITERATURE REVIEW”, IJEPC, vol. 11, no. 64, pp. 01–27, Sep. 2026.