Gingrich, N., & Maple, T. (2007). A contract with the Earth. Johns Hopkins University Press.
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Chicago-čujuhus (17. p.)
Gingrich, Newt, juo Terry Maple. A Contract with the Earth. Baltimore: Johns Hopkins University Press, 2007.
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MLA-čujuhus (9. p.)
Gingrich, Newt, juo Terry Maple. A Contract with the Earth. Johns Hopkins University Press, 2007.
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