Ermawati, L. S., Atiqoh, and Y. Wiyarno. “THE EFFECT OF PROBLEM BASED LEARNING MODEL AND ACHIEVEMENT MOTIVATION ON MATHEMATICS LEARNING OUTCOMES”. Jurnal Mantik, vol. 6, no. 2, Aug. 2022, pp. 2120-6, https://iocscience.org/ejournal/index.php/mantik/article/view/2747.