APA (7th ed.) Citation

Gingrich, N., & Maple, T. (2007). A Contract with the Earth. Johns Hopkins University Press.

Chicago Style (17th ed.) Citation

Gingrich, Newt, and Terry Maple. A Contract with the Earth. Baltimore: Johns Hopkins University Press, 2007.

MLA (8th ed.) Citation

Gingrich, Newt, and Terry Maple. A Contract with the Earth. Johns Hopkins University Press, 2007.