If you're interested in marketing and Google Analytics, and have $27 and the time to read 450 pages to spare, Google thinks it knows of just the right book for you. Yesterday evening, the search giant took the rather unusual step of endorsing a privately-authored paperback called Performance Marketing with Google Analytics . Again, the book wasn't put out by Google or even any current employees. Instead, it was written by Sebastian Tonkin, who used to work for the company,