Grygiel, J. J. (2006). Great powers and geopolitical change. Johns Hopkins University Press.
Lua i Stíl Chicago (17ú heag.)Grygiel, Jakub J. Great Powers and Geopolitical Change. Baltimore: Johns Hopkins University Press, 2006.
Lua MLA (8ú heag.)Grygiel, Jakub J. Great Powers and Geopolitical Change. Johns Hopkins University Press, 2006.
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