Marwadi, M., and Mughni Labib. “Saadoe’ddin Djambek’s Thoughts on Calculating the Beginning of the Hijri Month”. QISTHOSIA : Jurnal Syariah Dan Hukum, vol. 6, no. 1, July 2025, pp. 81-98, doi:10.46870/jhki.v6i1.1515.