In order referenced:
Christian, David. "Silk Roads or Steppe Roads? The Silk Roads in World History," Journal of World History 11.1 (2000): 1-26
Diamond, Jared. Guns, Germs, and Steel: The Fates of Human Societies. New York: Norton, 2005. Print.
Renault, Mary. The King Must Die. London: New English Library, 1971. Print.
Liu, Xinru. "Silks and Religions in Eurasia, c. A.D. 600-1200," Journal of World History 6.1 (1995): 25-48
Crystal, David, ed. Cambridge Encyclopaedia of Language (2nd ed.), selections ("How Many Languages?" "The Origins of Language""Families of Languages" "The Indo-European Family" "Other Families" and "Languages and Religion"). Cambridge: Cambridge University Press, 2003.
Oxtoby, Willard G., and Alan F. Segal, eds. A Concise Introduction to World Religions. Toronto: Oxford University Press Canada, 2007. Print.
Levinson, David, and Melvin Ember, eds. Encyclopedia of Cultural Anthropology (Ist ed., 4 vols.), selections ("Asia, Central" "Culture" "Ethnicity" "Religion"). New York: Henry Holt and Co., 1996.
Ma, Yong, and Sun Yutang. "The Western Regions under the Xiongnu and the Han." in History of Civilizations of Central Asia (Vol. II), 227-246. Ed. Janos Harmatta. Paris: UNESCO Publishing.
Liu, Xinru. "Migration and Settlement of the Yuezhi-Kushan: Interaction and Interdependence of Nomadic and Sedentary Socities." Journal of World History 12.2 (2001): 261-292.
Hintsch, Bret. "Myth and the Construction of Foreign Ethnic Identity in Early and Medieval China." Asian Ethnicity 5.1 (2004): 81-103.
Wriggins, Sally Hovey. Xuanzang: A Buddhist Pilgrim on the Silk Road, selections. Boulder: Westview Press 1996.
Lerner, Judith A. "The Merchant Empire of the Sogdians." in Monks and Merchants: Silk Road Treasures from Northwest China Gansu and Ningxia, 4th-7th Cent, 221-227. Ed A.L. Juliano and J. Lerner. New York: Harry N. Abrams, Inc., with The Asia Society, 2002.
Marshak, Boris I. "The Sogdians in their Homeland." in Monks and Merchants: Silk Road Treasures from Northwest China Gansu and Ningxia, 4th-7th Cent, 231-237. Ed A.L. Juliano and J. Lerner. New York: Harry N. Abrams, Inc., with The Asia Society, 2002.
Luo, Feng. "Sogdians in Northwest China." in Monks and Merchants: Silk Road Treasures from Northwest China Gansu and Ningxia, 4th-7th Cent, 239-245. Ed A.L. Juliano and J. Lerner. New York: Harry N. Abrams, Inc., with The Asia Society, 2002.
Bundy, David D. "Missioloical Reflections on Nestorian Christianity in China during the Tang Dynasty." in Religion in the Pacific Era, 14-30. Ed Frank Flinn and Tyler Hendricks. New York: Paragon House Publishers, 1985.
Schafer, Edward H. "The Glory of the Tang." in Golden Peaches of Samarkand, 7-39. Berkeley: University of California Press, 1963.
