Denny Muhammad Fajar, Ramli, M., Ariyanto, J., Widoretno, S., Sajidan, S. and Prasetyanti, N.M. 2020. Enhancing students’ thinking skills through project-based learning in biology. Biosfer. 13, 2 (Oct. 2020), 230-249. DOI:https://doi.org/10.21009/biosferjpb.v13n2.230-249.