Federal Ministry of Consumer Protection, Food and Agriculture. (2003). Federal Organic Farming Scheme.
Cita Chicago (17th ed.)Federal Ministry of Consumer Protection, Food and Agriculture. Federal Organic Farming Scheme. 2003.
Cita MLA (9th ed.)Federal Ministry of Consumer Protection, Food and Agriculture. Federal Organic Farming Scheme. 2003.
Atenció: Aquestes cites poden no estar 100% correctes.