Cita APA (7a ed.)

Boren, D., & Perkins, E. J. (1999). Preparing America's foreign policy for the 21st century. University of Oklahoma Press.

Cita Chicago Style (17a ed.)

Boren, David, y Edward J. Perkins. Preparing America's Foreign Policy for the 21st Century. Norman, Oklahoma: University of Oklahoma Press, 1999.

Cita MLA (9a ed.)

Boren, David, y Edward J. Perkins. Preparing America's Foreign Policy for the 21st Century. University of Oklahoma Press, 1999.