Febrianto, Y. and Kurniawati, D. 2023. Development of Integrated STEM-PjBL e-LKPD on Acid-Base Materials for Class XI SMA using Flip PDF Proffesional Software. Entalpi Pendidikan Kimia. 4, 2 (Jun. 2023), 31-39. DOI:https://doi.org/10.24036/epk.v4i2.314.