1. M. Grathwohl,World Energy Supply (Walter de Gruyter & Co., Berlin, 1982), pp. 14–20.
2. World Energy Outlook (Exxon Corporation, 1981).
3. Energy Security: A Report to the President of the United States (U.S. DOE Report No. DOE/S-0057, March 1987), p. 12.
4. W. G. Dupree and T. West,United States Energy Through the Year 2000 (U.S. Department of the Interior, Washington, D. C., 1975).
5. M. K. Hubbert,U.S. Energy Resources, A Review as of 1972 (U.S. Government Printing Office, Washington, D. C., 1974), pp. 28–55.