Não informado. (2004). Feed industry. Central Retail Feed Association.
Chicago-referens (17:e uppl.)Não informado. Feed Industry. Milwaukee, Wis: Central Retail Feed Association, 2004.
MLA-referens (8:e uppl.)Não informado. Feed Industry. Central Retail Feed Association, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.