This is an important question. There are so many books on this topic that you will need to be selective. I suggest that you read two types of books on this topic. First, you should read standard text books on this topic. Second, you should read recent academic books from reputable scholars or investigators. These recent books should furnish good bibliography and show you what the recent issues are. The best place to start is with a few modern books. Let me give you a few suggestions.
The first book you might want to explore is called, Cocaine Nation: How White Trade Took over the World. This book will give you a broad overview of the cocaine trade. It starts in the fields of Colombia and ends in the streets of New York. So, you really do get a snapshot of the whole trade.
For a more controversial book, you might want to take a look at: The Politics of Cocaine: How U.S. Foreign Policy has Created a Thriving Drug Industry in Central and South America. As the title suggestion, it will deal with US foreign policy.
For a more inside look, you can read: Kings of Cocaine: Inside the Medellin Cartel.
All of these books were published within the last few years. So, they are all recent. Use their bibliographies. Also if have access to an academic library, use academic databases to locate great articles on this topic. For examples, JSTOR would be a helpful database of many articles. Through key term searches, you should have more than enough.