M. Smith 
Nato Enlargement During the Cold War [PDF ebook] 
Strategy and System in the Western Alliance

Why did NATO expand its membership during the Cold War years, and what was its attraction to new members? This book locates the answers to these questions not solely in the Cold War, but in the historical problems of international order in Europe and the growing idea of the West. A wide range of sources is used, and the analysis looks at a process of neo-enlargement during NATO’s inception as well as the formal accessions that followed.