BIBLIOGRAPHY CONTRIBUTOR Zakarīyā Yūsuf First name Zakarīyā Last name Yūsuf Bibliography entries by this contributor Ibn Sīnā, Al-Ḥusayn. 1956. Al-Šifāʾ. 3. Al-Riyāḍīyāt. Ǧawāmiʿ ʿIlm Al-Mūsīqà. Ed. Zakarīyā Yūsuf. Cairo: Maṭbaʻa al-Amīrīya.