Manurung, Rina Sara Jantri, and Masdiana Sinambela. “Pengembangan Lembar Kerja Peserta Didik Berbasis Problem Based Learning Pada Materi Sistem Pertahanan Tubuh Di Kelas XI SMA Negeri 4 Medan”. Continuous Education: Journal of Science and Research, vol. 6, no. 2, Sept. 2025, pp. 407-24, doi:10.51178/ce.v6i2.2738.