Charles D. Ferguson & William C. Potter 
The Four Faces of Nuclear Terrorism [PDF ebook] 

The Four Faces of Nuclear Terrorism, a new book from the Center for Nonproliferation Studies, assesses the motivations and capabilities of terrorist organizations to acquire and use nuclear weapons, to fabricate and and detonate crude nuclear explosives, to strike nuclear power plants and other nuclear facilities, and to build and employ radiological weapons or ‘dirty bombs.’