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APA

Curtis, C. B., Program on Energy, the Environment, and the Economy (Aspen Institute), & Energy Policy Forum. (1997). 2020 vision: The energy world in the next quarter century : 21st annual summer policy forum. Washington, DC: The Aspen Institute.

MLA

Curtis, Charles B. 2020 Vision: The Energy World in the Next Quarter Century : 21st Annual Summer Policy Forum. Washington, DC: The Aspen Institute, 1997. Print.

CHICAGO

Curtis, Charles Brent. 1997. 2020 vision: the energy world in the next quarter century : 21st annual summer policy forum. Washington, DC: The Aspen Institute.

HARVARD

CURTIS, C. B. (1997). 2020 vision: the energy world in the next quarter century : 21st annual summer policy forum. Washington, DC, The Aspen Institute.

TURABIAN

Curtis, Charles Brent. 2020 Vision: The Energy World in the Next Quarter Century : 21st Annual Summer Policy Forum. Washington, DC: The Aspen Institute, 1997.