Book? He should forget that. You should have told him that gambling is not something to take as seriously as that, what he needs to learn and strictly observe are the simple ways to work around the particular game and how to keep himself and his account safe. In casino games, anyone reading about an approach to win is just a future loser, it will disappoint the person. I advise him to take gambling lightly, gambling with a negligible amount and preserve his mental health.