Tambunan, E., S. C. br Sitepu, T. A. Witin, and W. Arwita. “Analisis Penerapan Model Pembelajaran Problem Based Learning Pada Pelajaran Biologi Materi Sistem Ekskresi Kelas X SMA Negeri 4 Binjai: (Analysis of the Application of the Problem Based Learning Model in Biology Lessons on the Excretory System Material for Class High School 4 Binjai)”. BIODIK, vol. 10, no. 2, June 2024, pp. 172-80, doi:10.22437/biodik.v10i2.33934.