Marzuki, M. “THE EFFECT OF IMPLEMENTING A COOPERATIVE LEARNING MODEL OF GROUP INVESTIGATION (GI) TYPE ON STUDENT LEARNING OUTCOMES ON ECOSYSTEM MATERIALS IN CLASS XA OF STATE MIDDLE SCHOOL 2 SINTANG”. NUSRA : Jurnal Penelitian Dan Ilmu Pendidikan, vol. 4, no. 4, Nov. 2023, pp. 1091-0, doi:10.55681/nusra.v4i4.1755.