References
- Sagan, S., and K. Waltz. 1995. The spread of nuclear weapons: a debate. New York: W.W. Norton.
- Sagan, S., and K. Waltz. 2002. The spread of nuclear weapons: a debate renewed. New York: W.W. Norton.
- Sagan, S., and K. Waltz. 2012. The spread of nuclear weapons: an enduring debate. New York: W.W. Norton.