Abdullah, M. S., Benest, I., Paige, R., Kimble, C., & Parent, C. (2007). Using unified modeling language for conceptual modelling of knowledge-based systems. Springer Berlin Heidelberg.

Abdullah, Mohd Syazwan, Ian Benest, Richard Paige, Chris Kimble, و Christine Parent. Using Unified Modeling Language for Conceptual Modelling of Knowledge-based Systems. Springer Berlin Heidelberg, 2007.

Abdullah, Mohd Syazwan, et al. Using Unified Modeling Language for Conceptual Modelling of Knowledge-based Systems. Springer Berlin Heidelberg, 2007.