1. The Analysis of Covariance and Alternatives;Huitema,1980
2. Categorical Data Analysis;Agresti,1990
3. An Introduction to Categorical Data Analysis;Agresti,1996
4. Rank Analysis of Covariance;Quade;Journal of the American Statistical Association,1967
5. Analysis of Covariance Based on General Rank Scores;Puri;Annals of Mathematical Statistics,1969