World Wilderness Congress Worldwide Conservation, Gregg, W. P., Krugman, S. L., & Wood, J. D. (1987). Fourth World Wilderness Congress Worldwide Conservation: Proceedings of the Symposium on Biosphere Reserves, september 11-18, 1987 YMCA of the Rockies Estes Park Center, Estes Park, Colorado, USA. Atlanta, Georgia: U.S. Department of the Interior National Park Service, Science Publications Office.
Citación estilo ChicagoWorld Wilderness Congress Worldwide Conservation, William P. Gregg, Stanley L. Krugman, y James D. Wood. Fourth World Wilderness Congress Worldwide Conservation: Proceedings of the Symposium On Biosphere Reserves, September 11-18, 1987 YMCA of the Rockies Estes Park Center, Estes Park, Colorado, USA. Atlanta, Georgia: U.S. Department of the Interior National Park Service, Science Publications Office, 1987.
Cita MLAWorld Wilderness Congress Worldwide Conservation, William P. Gregg, Stanley L. Krugman, y James D. Wood. Fourth World Wilderness Congress Worldwide Conservation: Proceedings of the Symposium On Biosphere Reserves, September 11-18, 1987 YMCA of the Rockies Estes Park Center, Estes Park, Colorado, USA. Atlanta, Georgia: U.S. Department of the Interior National Park Service, Science Publications Office, 1987.