Federal Ministry of Consumer Protection, Food and Agriculture. (2003). Federal Organic Farming Scheme.
Chicago-referens (17:e uppl.)Federal Ministry of Consumer Protection, Food and Agriculture. Federal Organic Farming Scheme. 2003.
MLA-referens (9:e uppl.)Federal Ministry of Consumer Protection, Food and Agriculture. Federal Organic Farming Scheme. 2003.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.