Oh, so rapidly, thanks! Then, pls, give a source to find a book that has nothing common with math, but I need it: I'm about "Unbroken" by Laura Hillenbrand - ? I have two problems in economics and philosophy and I have to correct them till the summer end. I am searching for these books to get help on power query and a summary for the second. My God, when I will end all this nightmare of university (I don't want it, it's for my mother), I'll be the happiest. (Thanks in advance for understanding me and the sources!)