1. Alan Frost - Organizational Memory and Knowledge Repositorieshttp. (n.d.). Retrieved from www.knowledge-management-tools.net/organizational-memory-and-knowledge.html
2. Alan Frost - The Different Types of Knowledge. (n.d.). Retrieved from http://www.knowledge-management-tools.net/different-types-of-knowledge.html
3. Barbiero, B. (2004). Tacit knowledge. Dictionary of Philosophy of Mind. Retrieved from http://philosophy.uwaterloo.ca/MindDict/tacitknowledge.html
4. Bellinger, G., Castro, D., & Mills, A. (2004). Systems Thinking. Retrieved from http://www.systems-thinking.org/
5. Bernstein, J. H. (2014). The Data-Information-Knowledge-Wisdom Hierarchy. Retrieved from http://inls151f14.web.unc.edu/files/2014/08/bernstein.pdf