Recommended readings
See the following texts for more information on analysis of variance:
Brown, M. B., and A. B. Forsythe. 1974b. Robust tests for the equality of variances. Journal of the American Statistical Association, 69:, 364-367.
Levene, H. 1960. Robust tests for equality of variances. In: Contributions to Probability and Statistics: Essays in Honor of Harold Hotelling, I. Olkin, eds. Palo Alto, Calif.: Stanford University Press.
Milliken, G., and D. Johnson. 1992. Analysis of Messy Data: Volume 1. Designed Experiments. New York: Chapman & Hall.
Neter, J., W. Wasserman, and M. H. Kutner. 1990. Applied Linear Statistical Models, 3rd ed. Homewood, Ill.: Irwin.
Welch, B. L. 1951. On the Comparison of Several Mean Values: An Alternative Approach. Biometrika, 38:, 330-336.