“THE EFFECT OF THE PROJECT BASED LEARNING MODEL IN STUDENTS’ CRITICAL THINKING SKILLS ON ENVIRONMENTAL POLLUTION SUBJECTS”. BIOTIK: Jurnal Ilmiah Biologi Teknologi Dan Kependidikan, vol. 9, no. 1, Apr. 2021, pp. 74-80, https://doi.org/10.22373/biotik.v9i1.8220.