1. Alderson, L. (Ed.), 1990. Genetic Conservation of Domestic Livestock, Wallingford, UK, CAB International.
2. Bundesministerium für Ernährung, Landwirtschaft und Forstenof (Germany), http://www.bml.de.
3. Department of Agriculture, Food and Rural Development (DAFRD) of Ireland, http://www.irlgov.ie/daff.
4. Direcciòn General de Desarrollo Rural, Ministerio de Agricoltura, Pesca y Alimentaciòn (Spain), http://www.mapya.es.
5. Directorate for Food, Fisheries and Agri-business of Denmark, http://www.foedevareministeriet.dk.