APA-Zitierstil (7. Ausg.)

Gingrich, N. (2007). A contract with the Earth. Johns Hopkins University Press.

Chicago-Zitierstil (17. Ausg.)

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

MLA-Zitierstil (9. Ausg.)

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