Cahyasari, Angelia, Mohammad Budiyanto, and Enny Susiyawati. 2020. “USING PROJECT-BASED LEARNING WORKSHEET WITH WASTE WATER TREATMENT THEME TO PRACTICE STUDENT’ PROBLEM-SOLVING SKILLS”. PENSA: E-JURNAL PENDIDIKAN SAINS 8 (2), 110-14. https://ejournal.unesa.ac.id/index.php/pensa/article/view/38368.