Sinulingga, B., N. Jannah, and A. M. B. Syarbaini. “The Competition of the Insurance Company in Medan City Is Undermined by the Quality of the Agent’s Work”. Journal La Bisecoman, Vol. 5, no. 4, Aug. 2024, pp. 647-61, doi:10.37899/journallabisecoman.v5i4.1448.