1. Brachman, R.J., Levesque, H.J.: Knowledge Representation and Reasoning. Morgan Kaufmann, San Francisco (2004). ISBN 978-1-55860-932-7
2. Nawaz, M.S., Hassan, M, Shaukat, S.: Impact of knowledge management practices on firm performance: testing the mediation role of innovation in the manufacturing sector of Pakistan. Pak. J. Commer. Soc. Sci. 8(1), 99–111. Clancey, B.: Acquiring, representing and evaluating a competence model of diagnostioc strategy. Technical Report: CS-TR-85–1067, Stanford University (1985)
3. Russell, S.J., Norvig, P.: Artificial Intelligence: A Modern Approach, 3rd edn. Prentice Hall, Upper Saddle River (2009)
4. Woolf, B.: Building Intelligent Interactive Tutors: Student-centered Strategies for Revolutionizing E-learning. Morgan Kaufmann, San Francisco (2008)
5. Wenger, E.: Artificial Intelligence and Tutoring Systems: Computational and Cognitive Approaches to the Communication of Knowledge. Morgan Kaufmann Publishers Inc., Los Altos (1987)