[1] Meat and Livestock Austrilia. http://www./.
[2] Cattlemen's Beef Board and National Cattlemen's Beef Association. http://www./.
[3]U.S. Meat Export Federation. http://www./.
[4] http://www.maff./.
[5] United Nations Economic Commission For Europe.http://www./fileadmin/DAM/trade/agr/standard/meat/.