Clark, S. G. (2008). Ensuring greater Yellowstone's future: Choices for leaders and citizens. Yale University Press.
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Chicago Style (17th ed.) Zitazioa
Clark, Susan G. Ensuring Greater Yellowstone's Future: Choices for Leaders and Citizens. New Haven, Conn.: Yale University Press, 2008.
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MLA (9th ed.) Zitazioa
Clark, Susan G. Ensuring Greater Yellowstone's Future: Choices for Leaders and Citizens. Yale University Press, 2008.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.