Sellars, R. W. (1997). Preserving nature in the national parks: A history : with a new preface and epilogue. Yale University Press.
Chicago-Zitierstil (17. Ausg.)Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. New Haven: Yale University Press, 1997.
MLA-Zitierstil (9. Ausg.)Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. Yale University Press, 1997.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.