That's not helpful. We get this dichotomy where half the self-help books are like Gray's, saying leave him alone while the wife supervises the kids' homework, cooks dinner and turns to her girlfriends for emotional support. That's the very advice that gets people into trouble, not out of trouble. That's a common complaint Zimmerman and other marriage and family therapists hear. Balderdash, Zimmerman says.
People tend to go for the sellers, and a lot of that is based on what's being marketed.
And if you've looked up the author, and still aren't clear, look in the back of the book. If it doesn't, that suggests this is the opinion of one person, not authorities who know what they're talking about. Ask other professionals for recommendations. I can't imagine that anyone would charge you just to recommend a book. My guess is that there would be a couple of books everyone would recommend.