Halberg, Niels; Peramaiyan, Panneerselvam and Walaga, Charles (2009) Is Organic Farming an Unjustified Luxury in a World with too many hungry People? In: Willer, Helga and Kilcher, Lukas (Eds.) The World of Organic Agriculture. Statistics & Emerging Trends 2009, FiBL and IFOAM, pp. 95-100.