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Hurni, Hans; Osman-Elasha, Balgis; Giger, Markus; Klaey, Andreas; Ott, Cordula; Hoeggel, Udo; Rist, Stephan; Portner, Brigitte (2009). Context, conceptual framework and sustainability indicators. In: McIntyre, Beverly D.; Herren, Hans; Wakhungu, Judi; Watson, Robert T. (eds.) Agriculture at a Crossroads: Global Report. International Assessment of Agricultural Knowledge, Science and Technology for Development (pp. 1-56). Washington: Island Press