Indah Permata Sari, Fadil KF, Ade Irma Imamah. The Effect of the Problem-Based Learning Model Using the AMK (Mystery Case Envelope) Media on Third-Grade Students’ Critical Thinking Skills in Civic Education at MI Mathlaul Anwar. JEP [Internet]. 2026 Mar. 30 [cited 2026 Sep. 25];8(1):88-95. Available from: https://jepjurnal.stkipalitb.ac.id/index.php/hepi/article/view/547