Hapsari, M. P., Sukarno, A. D. . Setyari, A. . Sofyan, and A. . . Sariono. “Linguistic Politeness in Jember University Library Services”. International Journal of Language and Literary Studies, vol. 8, no. 5, Sept. 2026, pp. 343-55, doi:10.36892/ijlls.v8i5.2765.