(1997). 2020 vision: The energy world in the next quarter century : 21st annual Summer Policy Forum. Washington, DC: The Aspen Institute.
Chicago Style Citation2020 Vision: The Energy World in the Next Quarter Century : 21st Annual Summer Policy Forum. Washington, DC: The Aspen Institute, 1997.
MLA Citation2020 Vision: The Energy World in the Next Quarter Century : 21st Annual Summer Policy Forum. Washington, DC: The Aspen Institute, 1997.
Warning: These citations may not always be 100% accurate.