1. Bartlett, C. R. (1976).Heritabilities and Genetic Correlations Between Hip Dysplasia and Temperament Traits of Seeing Eye Dogs, Masters thesis, Rutgers University, New Brunswick, NJ.
2. Annual Progress Report;M. Castleberry,1975
3. Falconer, D. S. (1981)Introduction to Quantitative Genetics, 2nd ed., Longman, New York.
4. Fält, L., Swenson, L., and Wilsson, E. (1982). Mentalbeskrivning av valpar. Battre Tjanstehundar, Projektrapport II. Statens Hundskola, Sveriges Lantbruksuniversitet and Stockholms Universitet.
5. Foley, C. W., Lasley, J. F., and Osweiler, G. D. (1979).Abnormalities of Companion Animals: Analysis of Heritability, Iowa State University Press, Ames.