Sari, Lydiana Putri Novita, Dyah Ayu Fajarianingtyas, and Jefri Nur Hidayat. “VALIDITAS INSTRUMEN PENILAIAN KEMAMPUAN BERPIKIR KRITIS MELALUI MODEL PROBLEM BASED LEARNING MENUJU PEMBELAJARAN IPA ABAD KE 21”. LENSA (Lentera Sains): Jurnal Pendidikan IPA 10, no. 2 (November 16, 2020): 125-136. Accessed May 19, 2021. https://jurnallensa.web.id/index.php/lensa/article/view/121.