Sunarsini, Mahmud Yunus, Sadjidon, and Auda Nuril Z. “EMETAAN ONTRAKTIF ADA UANG -ETRIK ONE ERNILAI R^2”. imits: ournal of athematics and ts pplications, vol. 13, no. 2, Aug. 2025, pp. 1-10, https://journal.its.ac.id/index.php/limits/article/view/5310.