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8.1 Siti web consultati

www.agroeco.org – Agroecology in Action

www.attra.org - National Sustainable Agriculture Information Service, USDA

www.intercrop.dk – Sito ufficiale del progetto di ricerca dell'Unione Europea “Intercropping of cereals and grain legumes for increased production, weed control, improved product quality and prevention of N-losses in European organic farming systems”, 5th Framework Programme of RTD, Quality of Life specific programme, Key Action 5 - Sustainable Agriculture

www.oacc.info – Organic Agriculture Centre of Canada

www.orgprints.org - International open access archive for papers related to research in organic agriculture

www.sinab.it – Sistema Informativo Nazionale sull'Agricoltura Biologica

www.umanitoba.ca/outreach/naturalagriculture/index.html - University of Manitoba, Department of Plant Science

www.wikipedia.org – Wikipedia: l'enciclopedia libera