1. The Coming of Post-Industrial Society: a Venture in Social Forecasting;Bell,1976
2. Substitution of information for energy: conceptual background, realities and limits;Chen;Energy Policy,1994
3. Energy and Information in Society: a Study of the Relationships Between Energy Use and Information Activities in Contemporary Society;Campos Machado,1994
4. The Production and Distribution of Knowledge in the United States;Machlup,1962
5. ‘Knowledge: its creation, distribution and economic significance’, III, The Economics of Information and Human Capital;Machlup,1984