Freund, R. J., Littell, R. C., and Spector, P. C. (1991), SAS System for Linear Models, Cary, NC: SAS Institute Inc.

Goodnight, J. H. (1978), Tests of the Hypotheses in Fixed-Effects Linear Models, Technical Report R-101, SAS Institute Inc, Cary, NC.

Goodnight, J. H. (1979), “A Tutorial on the Sweep Operator,” The American Statistician, 33, 149–158.

Harvey, W. R. (1960), Least-Squares Analysis of Data with Unequal Subclass Frequencies, Technical Report ARS 20-8, USDA, Agriculture Research Service.

Henderson, C. R. (1953), “Estimation of Variance and Covariance Components,” Biometrics, 9, 226–252.

Milliken, G. A. and Johnson, D. E. (1984), Analysis of Messy Data, Volume I: Designed Experiments, Belmont, CA: Lifetime Learning Publications.