Sjarifudin, D., Tri Widyastuti, Istianingsih, and Sugeng Suroso. “The Effect of Self-Efficacy, Competence, Work Discipline, Employee Engagement on Work Performance and Work Motivation: Empirical Study on Umrah Travel Agency”. Formosa Journal of Sustainable Research, vol. 2, no. 12, Dec. 2023, pp. 2827-44, doi:10.55927/fjsr.v2i12.6963.