Willer, Helga (2007) Information sources: Overview. In: Willer, Helga and Yussefi, Minou (Eds.) The World of Organic Agriculture - Statistics and Emerging Trends 2007, International Federation of Organic Agriculture Movements (IFOAM), Bonn, Germany and Research Institute of Organic Agriculture FiBL, Frick, Switzerland, chapter 6: Data and Market Access Information, pp. 45-49.