Dalil al-Muslim al-falaki fi rasd hilal Ramadan wa-Shawwal wa-taḥdid maw'ad al-munasabat al-Islamiyah hatta'am 1441 H al-mawafiq li-sanat 2020 M - Mujahid,'Imad ('Amman : Dar Hunayn, 1993)
Keywords: Islamic calendar; Astronomy -- Religious aspects -- Islam