Ishaq, M. 2005. “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 4 (1): 10-20. https://doi.org/10.35719/fenomena.v4i1.360.