APA (7 ম সংস্করণ) উদ্ধৃতি

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

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

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

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

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