Sellars, R. W. (1997). Preserving nature in the national parks: A history : with a new preface and epilogue. Yale University Press.
Цитирование в стиле Чикаго (17-е изд.)Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. New Haven: Yale University Press, 1997.
Цитирование MLA (9-е изд.)Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. Yale University Press, 1997.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.