1. Berton, Pierre. 1965.The Comfortable Pew, 90ffPhiladelphia: J. S. Lippincott.
2. Thielicke, Helmut. 1965.The Trouble with the Church, Edited by: Doberstein, John W. 2New York: Harper and Row.
3. Howe, Reuel L. 1967.Partners in Preaching, 32–33. New York: Seabury Press.
4. Reid, Clyde. 1967.The Empty Pulpit: A Study of Preaching as Communication, 29–30. New York: Harper and Row.
5. Clozentropy: A procedure for testing English language proficiency of foreign students