Cita APA
Gingrich, N., & Maple, T. (2007). A contract with the Earth. Johns Hopkins University Press.
Citación estilo Chicago
Gingrich, Newt, and Terry Maple. A Contract with the Earth. Baltimore: Johns Hopkins University Press, 2007.
Cita MLA
Gingrich, Newt, and Terry Maple. A Contract with the Earth. Johns Hopkins University Press, 2007.
Warning: These citations may not always be 100% accurate.