Tarigan, M., and Fadillah. “Upaya Penyempurnaan Alat Ukur: Analisis Validitas PAPI Kostick Item Revisi”. Jurnal Studia Insania, vol. 13, no. 2, Dec. 2025, pp. 134-5, https://jurnal.uin-antasari.ac.id/index.php/insania/article/view/18185.