1. AGRESTI, A.(1990) Categorical data analysis, Wiley, N.Y.
2. BROCKHOFF, P.M. (1994) Statistical Analysis of Sensory Data. Ph.D. thesis, Dept. of Mathematics and Physics and Center of Food Research, Royal Veterinary and Agricultural University, Copenhagen, Denmark.
3. BROCKHOFF, P.M., HIRST, D. and NAES, T. (1995). Three way factor methods in sensory analysis. In: Multivariate statistics for Sensory Data, Ed. T. Naes and E. Risvik, Elsevier Science Publishers, Amsterdam, The Netherlands.
4. CLOGG, CLIFFORD C. and EDWARD S. SHIDADEH (1994). Statistical Models for Ordinal Variables, Thousand Oaks, CA.: Sage Publications.
5. DE LEEUW, J., VAN DER HEIJDEN, P.G.M., and VERBOON, P. (1990). A latent time budget model, Statistica Neerlandica, 44, 1, 1–21.