1. Addelman, S., "Recent developments in the design of factorial experiments", Journal of the American Statistical Association, Vol. 67, No. 337, (1972), 103-111.2. Davies, O.L., "The design and analysis of industrial experiments", The Design and Analysis of Industrial Experiments, (1954), 234-251.3.Yates, F., "The design and analysis of factorial experiments", Imperial Bureau of Soil Science, (1978), 113-125. 4.Margolin, B.H., "Systematic methods for analyzing 2p 3 m factorial experiments with applications", Technometrics, Vol. 9, No. 2, (1967), 245-259.5.Draper, N.R. and Stoneman, D.M., "Response surface designs for factors at two and three levels and at two and four levels", Technometrics, Vol. 10, No. 1, (1968), 177-192.6.Alkarkhi, A. F. M., Low, H.C. and Quah, S.H., "A new method for analyzing experiments of type 2p", Proceedings of the National Conference on Management Science/Operation Research, (2000), 123-130.7.Alkarkhi, A. F. M., "A new method for analyzing experiments of type 2p, 3m, and 2p3m", Ph.D thesis, Universiti Sains Malaysia, (2001). 8. Alkarkhi, A.F. M. and Low, H., "A proposed technique for analyzing experiments of type 2p 3m", Modern Applied Science, Vol. 3, No. 1, (2009), 95-102.9. Alqaraghuli, W.A., Alkarkhi, A.F. and Low, H., "A new procedure for fitting second-order model to four-level factorial designs", World Applied Sciences Journal, Vol. 22, No. 8, (2013), 1116-1128.10. Alqaraghuli, W. A. A., Alkarkhi, A. F. M. , H. C. Low, “Fitting Second-order Models to Mixed Two-level and Four-level Factorial Designs: Is There an Easier Procedure?”, International Journal of Engineering, Vol. 28, No. 11, (2015), 1644-1650.11. Alqaraghuli, W. A.A., Alkarkhi, A. F. M and H.C. Low,.”Fitting Second-Order Model to Mixed Three-Level and Four-Level Factorial Designs Using the Coefficient of Polynomial Contrast”, World Applied Sciences Journal, 33 (9), (2015), 1450-1456.12. Kovo, A., "Application of full 42 factorial design for the development and characterization of insecticidal soap from neem oil", Leonardo Electronic Journal of Practices and Technologies, Vol. 8, No. 1, (2006), 29-40.13. Hosseinpour, M.N., Najafpoura, G.D., Younesi, H., Khorrami, M. and Vaseghi, Z., "Lipase production in solid state fermentation using aspergillus niger: Response surface methodology", International Journal of Engineering, Vol. 25, No. 3, (2012), 151-159.14. Kavardi, S.S., Alemzadeh, I. and Kazemi, A., "Optimization of lipase immobilization", International Journal of Engineering, Transactions A: Basics Vol. 25, No. 1, (2012), 1-9.15. Yahyaei, M., Bashiri, M. and Garmeyi, Y., "Multicriteria logistic hub location by network segmentation under criteria weights uncertainty" International Journal of Engineering, Transactions B: Applications Vol. 27, No. 8 (2014), 1205-1214.16. Roger G. P., "Design and analysis of experiment", New York, USA: Marcel Dekker, INC, (1985) Meyers, .R.H., Montgomery, D.C., Response Surface Methodology, second ed., Wiley-Interscience publication, New York, NY, 2002.