This is sort of a "classic" book that I wanted to have because it is very useful, a lot of good examples, very practical and at the same time very scientific. I am very happy I got it. By the way, I bought a pre-owned book, and its condition was simply excellent. For a good price I got an excellent book, in excellent condition. All my books arrived at an earlier time than expected. Yes, I will continue buying from Amazon and its branches.