Instruct: Classify the given review as either positive or negative.
Query: Invaluable reference source

As an international equity portfolio manager specializing in Japanese equities, this book is a very valuable reference source. The book describes many of the key institutions and their interlocking nature. Full of cross references, addresses & phone numbers (for institutions) and mini bibliographies for most major concepts, this book is a great hub for studying the Japanese economy. I look forward to the next edition.