Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Important Book to Own

This book is an important book for anyone working with alcohol or drug abusers or addicts, or anyone wanting to gain accurate information about alcohol and substance use, abuse and the nature of addiction. It is very readable and includes the biological aspects and the history of alcohol and substance use and abuse. I had originally considered selling it back through Amazon after my class was over but have decided to keep this book for future reference.