AZIZAH SORMIN, M.; SORMIN, D.; RAHMA YANTI SORMIN, M.; KHOLIJAH, A.; SIREGAR, I. Development of Problem Based Mathematics Module (Calculating Professional Zakat) to Improve Student’s Mathematic Problem Solving. KnE Social Sciences, v. 8, n. 4, p. 292–298, 3 Mar. 2023.