“Penentuan Awal Bulan Qamariyah: Studi Kasus Di Pesantren Mahfilu Al-Dzura Suger Jelbuk Jember: Determining the Beginning of the Qamariyah Month: A Case Study at Mahfilu Al-Dzura Islamic Boarding School, Suger, Jelbuk, Jember”. Fenomena, vol. 4, no. 1, Mar. 2005, pp. 10-20, https://doi.org/10.35719/fenomena.v4i1.360.