Encyclopedia Islamica
"Encyclopaedia Islamica Online is based on the abridged and edited translation of the Persian Dāʼirat al-Maʿārif-i Buzurg-i Islāmī, one of the most comprehensive sources on Islam and the Muslim world. A unique feature of the Encyclopaedia Islamica Online lies in the attention given to Shiʿi Islam and its rich and diverse heritage. In addition to providing entries on important themes, subjects and personages in Islam generally, Encyclopaedia Islamica Online offers the Western reader an opportunity to appreciate the various dimensions of Shiʿi Islam, the Persian contribution to Islamic civilization, and the spiritual dimensions of the Islamic tradition." -- Home page.