PENDEKATAN METODOLOGI KAJIAN KES ISU DAN CABARAN KESATUAN SEKERJA: ANALISIS KAJIAN LEPAS: METHODOLOGICAL APPROACH TO THE CASE STUDY OF TRADE UNION ISSUES AND CHALLENGE: ANALYSIS OF PAST STUDIES. qjssh. 2025;6(3):365-373. doi:10.55197/qjssh.v6i3.534