Gonzalez-Martinez, A., M. Herrera, M. Luque, and E. Rodero. “Influence of Farming System and Production Purpose on the Morphostructure of Spanish Goat Breeds”. Spanish Journal of Agricultural Research, Vol. 12, no. 1, Feb. 2014, pp. 117-24, doi:10.5424/sjar/2014121-4673.