(21) Stchoukine, Ivan. Le Suicide collectif dans le Raskol russe. Paris, 1903.
(22) Bussell, F. W. Religious Thought and Heresy in the Middle Ages. London, 1918.
(23) Egli, Emil. Die Züricher Wiedertäufer zur Reformationszeit. Zürich, 1878.
(24) Bax, Ernest Belfort. Rise and Fall of the Anabaptists. New York, 1903.
(25) Schechter, S. Documents of Jewish Sectaries. 2 vols. Cambridge, 1910.
(26) Graetz, H. History of the Jews. 6 vols. Philadelphia, 1891-98.
(27) Jost, M. Geschichte des Judenthums und seiner Sekten. 3 vols. Leipzig, 1857-59.
(28) Farquhar, J. N. Modern Religious Movements in India. New York, 1915.
(29) Selbie, W. B. English Sects. A history of non-conformity. Home University Library. New York, 1912.
(30) Barclay, Robert. The Inner Life of the Religious Societies of the Commonwealth. London, 1876. [Bibliography.]