Nurhawa, W. O., M. R. I. Anggur, R. N. Agustanti, H. Susilo, M. Muntholob, and B. Balqis. “Analysis of Biology students’ Problem-Solving Skills Using the PBL Model through Lesson Study (LS) Online”. Journal of Learning Improvement and Lesson Study, vol. 1, no. 2, Apr. 2022, pp. 1-5, doi:10.24036/jlils.v1i2.18.