Instruct: Classify a review into positive or negative sentiment.
Query: Don't buy it!

This book is very poorly organized. It seems that the author doesn't understand what he writes. Many sections are vague and awkward. Sometimes the author just put the schalors' studies together without any clear introduction and comprehensive thinking. I really regret to choose this book as the textbook for my class. Don't buy it! If there is a option of 0 star, I would choose it definitely.