Cita APA (7th ed.)

Lieber, R. J. (2007). The American era: Power and strategy for the 21st century (1st pbk. ed. with updates and a postscript.). Cambridge University Press.

Cita Chicago (17th ed.)

Lieber, Robert J. The American Era: Power and Strategy for the 21st Century. 1st pbk. ed. with updates and a postscript. Cambridge: Cambridge University Press, 2007.

Cita MLA (9th ed.)

Lieber, Robert J. The American Era: Power and Strategy for the 21st Century. 1st pbk. ed. with updates and a postscript. Cambridge University Press, 2007.