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MLA
“National Parks in the Twenty-First Century.” Uncertain Path: A Search for the Future of National Parks, Foreword by Jonathan B. Jarvis, Director, National Park Service, by William C. Tweed and Jonathan B. Jarvis, 1st ed., University of California Press, Berkeley; Los Angeles; London, 2010, pp. 183–208, www.jstor.org/stable/10.1525/j.ctt1ppd6d.8. Accessed 28 July 2021.
APA
Tweed, W., & Jarvis, J. (2010). National Parks in the Twenty-first Century. In Uncertain Path: A Search for the Future of National Parks, Foreword by Jonathan B. Jarvis, Director, National Park Service (pp. 183-208). Berkeley; Los Angeles; London: University of California Press. Retrieved July 28, 2021, from http://www.jstor.org/stable/10.1525/j.ctt1ppd6d.8
CHICAGO
Tweed, William C., and Jonathan B. Jarvis. "National Parks in the Twenty-first Century." In Uncertain Path: A Search for the Future of National Parks, Foreword by Jonathan B. Jarvis, Director, National Park Service, 183-208. Berkeley; Los Angeles; London: University of California Press, 2010. Accessed July 28, 2021. http://www.jstor.org/stable/10.1525/j.ctt1ppd6d.8.

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