Cita APA (7a ed.)

Pifer, S., & O'Hanlon, M. E. (2012). The Opportunity: Next Steps in Reducing Nuclear Arms. Brookings Institution Press.

Cita Chicago Style (17a ed.)

Pifer, Steven, y Michael E. O'Hanlon. The Opportunity: Next Steps in Reducing Nuclear Arms. Washington, D.C.: Brookings Institution Press, 2012.

Cita MLA (8a ed.)

Pifer, Steven, y Michael E. O'Hanlon. The Opportunity: Next Steps in Reducing Nuclear Arms. Brookings Institution Press, 2012.