Hafiz, Muhammad, and Dhiauddin Tanjung. 2022. “Penetapan Kalender Hijriah Menurut Ulama Muhammadiyah Dan Nahdatul Ulama Di Indonesia”. JURNAL EDUKASI NONFORMAL 3 (2). https://jurnal.unimen.cloud/index.php/JENFOL/article/view/5041.