T. F. . Ndruru, M. Siregar, M. L. . Panjaitan, R. R. S. . Purba, and H. . Lubis, “Analysis of the Influence of Training, Discipline and Safety on the Performance of Medan City Fire Department Officers”, EAJMR, vol. 2, no. 6, pp. 2301–2320, Jun. 2023.