APA引文
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引文
Gingrich, Newt, and Terry Maple. A Contract with the Earth. Johns Hopkins University Press, 2007.
警告：這些引文格式不一定是100％准確.