“PENGEMBANGAN BUKU DIGITAL BERBASIS STEM MATERI PENCEMARAN TANAH KELAS VII SMPN 2 RAMBIPUJI”. Bio-Lectura : Jurnal Pendidikan Biologi, vol. 10, no. 2, Oct. 2023, pp. 202-13, https://doi.org/10.31849/bl.v10i2.15938.