Mustamin, K., W. Wahdah, D. Intiardy, A. M. Jumrah, and P. J. Pattiasina. “The Impact of Project-Based Learning on Students’ Collaboration Skills in Secondary Schools”. International Journal of Educational Research Excellence (IJERE), vol. 3, no. 2, Dec. 2024, pp. 992-8, doi:10.55299/ijere.v3i2.740.