Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Rip-off of an earlier work

This book is a pretty blatant knock-off of an earlier (and better-written) book, Football Against the Enemy by Simon Kuper. That's the better book to buy. While I don't fault the author for wanting to cash in, it would be nice if he at least would acknowledge the inspiration for this book, rather than lamely pass it off as his own "theory". (Someone might also want to tell him that this is a hypothesis, not a theory.)