APA-ийн эшлэл(7 дахь хэвлэлт)

Sellars, R. W. (1997). Preserving nature in the national parks: A history : with a new preface and epilogue. Yale University Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. New Haven: Yale University Press, 1997.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Sellars, Richard West. Preserving Nature in the National Parks: A History : With a New Preface and Epilogue. Yale University Press, 1997.