1. Council Regulation, (EC) No 2092/91. On Organic Production and Labelling of Organic Products and Repealing Regulationhttp://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2007:189:0001:0023:EN:PDF
2. Hvorfor køber forbrugerne økologi;Jensen,2008
3. Quantitative Concept Tests of Organic Premium Meat Productshttp://orgprints.org/28187/
4. Principles of Organic Agriculturehttp://www.ifoam.bio/en/organic-landmarks/principles-organic-agriculture
5. Natural living—a precondition for animal welfare in organic farming