1Helga Willer and Minon Yussefi.The World of Organic Agricul ture Statistics and Emerging Trends (2005)[EB/OL].[2006-02-20].http://orgprints.org/4297/01/1365-world-of-organic-agricu ltare.pdf
2Helga Willer and Minon Yussefi.The World of Organic Agricul ture Statistics and Emerging Trends (2004)[EB/OL].[2006-01-30].http://orgprints.org/2555/01/willer-yussfi-2004-world-of-o rganic.pdf
3Helga Willer and Minon Yussefi.The World of Organic Agricul ture Statistics and Emerging Trends (1999)[EB/OL].[2006-01-30].http://orgprints.org/2555/01/willer-yussfi-1999-world-of-organic.pdf
4Helga Willer and Minon Yussefi.The World of Organic Agricul ture Statistics and Emerging Trends (2003)[EB/OL].[2006-01-30].http://orgprints.org/2555/01/willer-yussfi-2003-world-of-organic.pdf
