1. Armstrong, M. and Baron, A. (1998). Performance Management: The New Reality, London: Institute of Personnel and Development
2. Schweiger, I. and Sumners, G.E. (1994). Optimizing the Value of Performance Appraisals
3. Chan, D.C.K., Yung, K.L., Ip, A.W.H. (2002). An Application of fuzzy sets to process performance evaluation, Integrated Manufacturing Systems, 237–246.
4. Cordon, O., Herera, F., and Peregrin, A. (1999). Looking for the best Defuzzification method features for each implication operator to design accurate fuzzy model, Department of Computer Science and Artificial Intelligent, Spain.
5. Garibaldi, J.M. and Ifeachor, E.C. (1999). Application of simulated Annealing Fuzzy Model Tuning to Umbilical Cord Acid-base Interpretation, IEEE Transactions on Fuzzy Systems, Vol. 7, No. 1.