A. Stuart Farson & David Stafford 
Security and Intelligence in a Changing World [PDF ebook] 
New Perspectives for the 1990s

This book, first published in 1991, examines the changes to security and intelligence agencies envisioned in the uncertain world at the end of the Cold War. While the central focus is on the Canadian Security Intelligence Service, its history, function and future, there are also comparative studies of the British, Soviet, American and Australian systems.