Heriawan , B., and A. Soelistiyono. “STRATEGY OF BROTOJOYO POST AGENT IN THE COMPETITION OF PACKAGE AND LETTER DELIVERY AGENTS: CASE STUDY POS AGENT BROTOJOYO SEMARANG”. International Journal of Social and Management Studies, vol. 3, no. 4, Mar. 2022, pp. 34-42, doi:10.5555/ijosmas.v3i4.162.