كتاب فضائل الاوقات - بيهقي، احمد بن الحسين 994-1066 (Bayrut Dar Ibn Hazm, 2003)
Keywords: Calendar, Islamic -- Early works to 1800; Fasts and feasts -- Islam -- Early works to 1800; Islam -- Customs and practices -- Early works to 1800; Time -- Religious aspects -- Islam -- Early works to 1800