Cita APA (7th ed.)
Sellars, R. W. (1997). Preserving nature in the national parks: A history : with a new preface and epilogue. Yale University Press.
Cita Chicago (17th ed.)
Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. New Haven: Yale University Press, 1997.
Cita MLA (9th ed.)
Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. Yale University Press, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.