indigenous folk traditions, Buddhism, Islam, Manichaeism and Nestorian Christianity
Below are key reference books that provide a general overview of a topic or help identify synonyms, related terms, or basic data. These sources often include references and lists of further readings.
Encyclopedia of Religion
Encyclopedia of Buddhism
The Oxford Companion to Christian Thought
Encyclopedia of Early Christianity
New Dictionary of the History of Ideas
The Oxford Encyclopedia of the Islamic World
Medieval Islamic Civilization by 
Berkshire Encyclopedia of China
Garland Encyclopedia of World Music: The Middle East
The Grove Encyclopedia of Islamic Art and Architecture
