2021. THE EFFECT OF THE PROJECT BASED LEARNING MODEL IN STUDENTS’ CRITICAL THINKING SKILLS ON ENVIRONMENTAL POLLUTION SUBJECTS. BIOTIK: Jurnal Ilmiah Biologi Teknologi dan Kependidikan. 9, 1 (Apr. 2021), 74–80. DOI:https://doi.org/10.22373/biotik.v9i1.8220.