What to read on Nuclear Proliferation?

Few topics in international relations consistently attract as much academic and policy interest as nuclear proliferation. The literature on the subject tends to focus on four central questions: Why do states seek nuclear weapons? How do they acquire the components necessary to build them? What are the consequences of proliferation? And how can nuclear weapons be kept out of the hands of nonstate actors? These issues will remain salient in the years to come, as the North Korean and Iranian nuclear programs advance, the threat of nuclear terrorism persists, and the full implications of the type of nuclear entrepreneurship practiced by such intermediaries as A. Q. Khan are revealed. One fact is clear: going nuclear has never been easier.
BRADLEY A. THAYER, Professor of Political Science at Baylor University.
These words really do describe topic at best.
Here is the link.