Agustini, F., D. Amanah, E. Ramadhani, و D. Harahap. "Communication Effectiveness: A Study at PT. Perkebunan Nusantara V Ria"u. International Online Journal of Language, Communication, and Humanities, م 7, عدد 1, Apr. 2024, ص 1 -14, doi:10.47254/insaniah.v7i1.157.