S. W. Oktavia, J. Siburian, and M. A. R. Hakim, “LITERATURE REVIEW: THE IMPACT OF PROBLEM-BASED LEARNING (PBL) MODEL ON STUDENTS’ COLLABORATION SKILLS IN 21ST CENTURY SCIENCE EDUCATION”, Edu. Jur. Pend. Fis, vol. 9, no. 3, pp. 306 - 312, Dec. 2024.