1. Badham, B. (1975): The effect of artificial breeding on the rate of genetic improvement of butterfat yield in Victorian Jerseys. MSc thesis. Univers. Melbourne
2. Baillie, J.R. (1972): The behavioural requirements necessary for auide dogs for the blind in the United Kingdom. Br. Vet J. 128, 477
3. Biship, Y.M.M.; Fienberg, S.E.; Holland, P.W. (1975): Discrete Multivariate Analysis: Theory and Practice. Cambridge: MIT press
4. Ehrman, L.; Parsons, P.A. (1976): The Genetics of Behaviour. Sunderland: Sinaver
5. Elston, R.C. (1977): Estimating ?heritability? of a dichotomous trait. Biometrics 33, 232?236