Lubis, F.; Nasution, M. A.; Fitri, A.; Rizwinie, K. S.; Sihaloho, J.; Pasaribu, R. A. A.; Salsabila, S.; Siregar, J. A. Factors Influencing Students’ Difficulties in Using Formal Indonesian Language in The Campus Environment. EJR 2023, 2, 155-158.