Cita APA (7a ed.)

Soukup, M. A., & Machlis, G. E. (2021). American covenant: National parks, their promise, and our nation's future. Yale University Press.

Cita Chicago Style (17a ed.)

Soukup, Michael A., y Gary E. Machlis. American Covenant: National Parks, Their Promise, and Our Nation's Future. New Haven: Yale University Press, 2021.

Cita MLA (8a ed.)

Soukup, Michael A., y Gary E. Machlis. American Covenant: National Parks, Their Promise, and Our Nation's Future. Yale University Press, 2021.