1. Anderson, J.R.: Analysis of student performance with the Lisp tutor. In: Diagnostic monitoring of skill and knowledge acquisition (N. Frederickson et al., eds.). Hillsdale, NJ: Lawrence Erlbaum Associates 1990
2. Anderson, J., & Reiser, B.: The Lisp tutor. Byte, 10, pp. 159–175 (1986)
3. Anderson, J.R., Boyle, C.F., Corbett, A.T., & Lewis, M.W.: Cognitive modeling and knowledge-based tutoring. Artificial Intelligence, 42, pp. 7–50 (1990)
4. Bloom, B.S.: The 2-sigma problem: The search for methods of group instruction as effective as one-to-one tutoring. Educational Researcher, 13., 6, pp. 4–16 (1984)
5. . Bowscher, J.E.: Educating America: Lessons learned in the nation’s corporations. New York: Wiley & Sons 1989