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Ramet, Pedro, ed. (1988) Eastern Christianity and Politics in the Twentieth Century. Christianity Under Stress, 1 . Duke University Press, Durham, North Carolina, United States of America. ISBN 9780822308270
Walters, Philip, ed. (1988) World Christianity: Eastern Europe. World Christianity (29). Missions Advanced Research and Communication Center, Monrovia, California, United States of America. ISBN 978-1854240651
Raikin, Spas T. (1988) The Bulgarian Orthodox Church. In: Eastern Christianity and politics in the twentieth century. Christianity Under Stress (1). Durham...(etc.): Duke University Press.. ISBN 0-8223-0827-4
Thomson, Robert W. (1988) Mission, Conversion, and Christianization: The Armenian Example. Harvard Ukrainian Studies, 12/13. pp. 28-45.
Tomka, Miklós (1988) Tendencies of Religious Change in Hungary. Archives des sciences sociales des religions, 65 (1). pp. 67-79. ISSN 0335-5985
