Yulanda, V., Hamidah, A. . and Anggereini, E. . (2023) “Development of Electronic Student Worksheets (E-LKPD) Based on Problem Based Learning as an Effort to Improve Critical Thinking of Grade VIII Middle School Students on Respiratory System Material”, Jurnal Penelitian Pendidikan IPA, 9(9), pp. 7326–7332. doi: 10.29303/jppipa.v9i9.4144.