1. Barbosa, C.G., 1993. Disertacao de Mestrado, Universidade federal de Minas Gerais, Brazil.
2. Estimation of genetic parameters for conformation traits in the Brasileira Pony Breed;Costa,1998
3. Conformation traits of Norwegian cold-blooded Trotters: heritability and the relationship with performance;Dolvik;Acta Agric. Scand., A Anim. Sci.,1999
4. The Ultimate Horse Book;Edwards,2000
5. Mathematical Statistics;Freund,1992