Ringo, Pedro Siringo, et al. “Analisis Sistem Pengendalian Internal Penerimaan Dan Pengeluaran Kas Pada Gereja Paroki St Petrus Medan Timur”. Innovative: Journal Of Social Science Research, vol. 3, no. 3, Aug. 2023, pp. 10885-97, https://j-innovative.org/index.php/Innovative/article/view/3445.