The Church of the East: A Concise History (Central Asian Studies) by Wilhelm Baum & Dietmar
MJ. Smith
MVP Posts: 54,930 
This book is not only valuable in its own right but is great at generating interest in other resources from the ancient church of the east and Nestorians.
Amazon blurb:
The Church of the East is currently the only complete history in English of the East Syriac Church of the East. It covers the periods of the Sassanians, Arabs, Mongols, Ottomans, the 20th century, and informs about the Syriac, Iranian and Chinese literature of this unique and almost forgotten part of Christendom.
Orthodox Bishop Alfeyev: "To be a theologian means to have experience of a personal encounter with God through prayer and worship."; Orthodox proverb: "We know where the Church is, we do not know where it is not."
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