I have not read any of Tony Oz's books. I have always assumed that they were Nasdaq oriented. I only trade listed but will eventually trade both. Are these books worth reading? Are they only about OTC trading? I have read many books on the subject of trading. I find most to be the same exact info in different words. It is very rare that you find a book that is orginal and fresh. Most of these books were written in response to the "daytrading" phenomenon in the nineties just to make a buck or two. The worst books I ever purchased: 1) Stock Patterns for Day Trading: You should have seen the look on my face when I first opened this book after waiting a month for it to be delivered. This book should have been written in gold for the price they charged..because the information was worthless. Barry Rudd is putz. But he got my money. 2) Hit and Run II: I bought this book because the first one was one of the best books I have ever read on the subject. I read the first one early in my career and it opened my eyes to new setups. The second one had no new ideas..they were the same setups as the first one with less rules. I can not complain though because the first book paid for the second many times over.