1. Jespersen LM. International and national organic standards in the EU. The Danish Agricultural Advisory Centre, Section for Ecology, Aarhus, Denmark, 1998. 75pp.
2. The Danish Ministry of Food, Agriculture and Fisheries. Adminstrative order on organic farming. Order no 697, 2000. 12pp.
3. Dalgaard T, Kelm M, Wachendorf M, Taube F, Dalgaard R. Energy balance comparison of organic and conventional farming. Proceedings from the OECD workshop on organic agriculture. 23–26 September 2002, Washington DC, USA. Session 2.2. Environmental aspects, 2002. 12pp.
4. International Federation of Organic Agriculture Movements. IFOAM norms, 2002. 139pp.
5. Økologisk Landsforening. Værdigrundlag for Økologisk Landsforening. www.okoland.dk, 2002 [in Danish].