Stoddart, William, What does Islam mean in today's world?, World Wisdom Books, 2011. Devin De Weese, Devin A, "Islamization and Native Religion in the Golden Horde", Penn State University Press, September 1, 1994 (ISBN 0-271-01073-8). Fred Astren, "Karaite Judaism and Historical Understanding", Univ of South Carolina Press, February 1, 2004 (ISBN 1-57003-518-0).