Zulfaidhah, Z., Palenewen, E., & Hardoko, A. (2018). Needs Analysis in the Problem Based Learning (PBL) Model Tools and Problems Regarding 7th Grade Students’ Science Learning Outcome at SMPN 2 Bongan. BIODIK, 4(1), 48 - 59. https://doi.org/10.22437/bio.v4i1.5508