1. Bechhofer, S., van Harmelen, F., Hendler, J., Horrocks, I., McGuinness, D. L., Patel-Schneider, P. F., & Stein, L. A. (Eds.). (2004, February 10). OWL Web ontology language reference – W3C recommendation. W3C. Retrieved from http://www.w3.org/TR/owl-ref/
2. Black, W. J., Jowett, S., Mavroudakis, T., McNaught, J., Theodoulidis, B., Vasilakopoulos, A., et al. (2004). Ontology-enablement of a system for semantic annotation of digital documents. In Proceedings of the 4th International Workshop on Knowledge Markup and Semantic Annotation (SEMANNOT 2004) – 3rd International Semantic Web Conference, Hiroshima, Japan.
3. Chen, H. (2006). Intelligence and security informatics for international security: Information sharing and data mining. New York: Springer.
4. Guest Editors' Introduction: Artificial Intelligence for Homeland Security
5. Clark, K. L., & Tärnlund, S.-A. (Eds.). (1982). Logic programming. London: Academic Press.