1. Beatty, I.D., 2004, February 3. Transforming student learning with classroom communication systems. Educause Center for Applied Research (ECAR) Research Bulletin ERB0403. (Retrieved June 12, 2006).
2. Repeating questions in prose learning;Boyd;Journal of Educational Psychology,1973
3. Buck, H.J., 1997. Maximizing student learning with the use of random oral questioning in the college classroom. Florida Journal of Educational Research 37. (Retrieved May 19, 2006)
4. Seven strategies to enhance neural branching;Cardellichio;Educational Leadership,1997
5. Chickering, A.W., Gamson, Z.F., 1987. March. Seven principles for good practice in undergraduate education. American Association of Higher Education Bulletin. (Retrieved June 10, 2006).