Weizsacker, E. v., Lovins, A. B., & Lovins, L. H. (1997). Factor four: Doubling wealth, halving resource use. Earthscan.
芝加哥风格引文Weizsacker, Ernst von, Amory B. Lovins, 与 L. Hunter Lovins. Factor Four: Doubling Wealth, Halving Resource Use. London: Earthscan, 1997.
MLA引文Weizsacker, Ernst von, et al. Factor Four: Doubling Wealth, Halving Resource Use. Earthscan, 1997.
警告：这些引文格式不一定是100％准确.