The writers of this book need to be a little more concise and little less concerned about the previous editions of their work. I've never seen so many sentences that begin with "the last edition" in my life. Their points are hardly ever clearly written. Many trees would've been saved if they just wrote an intro that explained the differences instead of needlessly weaving the details of how far they've come into every single paragraph. If I were you, professor reading this comment, read the book before you assign it.