APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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