Wilhelmy von Wolff, Manfred. 2007. «The American Era-Power and Strategy for the 21st Century : With a New Postcript Analyzing Foreign Policy After Iraq, Por Robert J. Lieber, Cambridge Y Nueva York : Cambridge University Press, 2007». Estudios Internacionales 40 (158):p. 241-245. https://doi.org/10.5354/0719-3769.2007.14136.