1. Kuehl, R. O.Design of Experiments: Statistical Principles of Research Design and Analysis.2nd ed. Duxbury Press, Pacific Grove, CA. Pp. 19, 92, 1999.
2. Lawless, H. T., and Heymann, H.Sensory Evaluation of Food Principles and Practices.Kluwer Academic/Plenum Publishers, New York. Pp. 332–333, 1999.
3. Lewis, M. J., and Young, T. W.Brewing.2nd ed. Kluwer Academic/Plenum Publishers, New York. Pp. 259–269, 2002.